Table of Contents
366 relations: Aaron Lufkin Dennison, Abbasid Caliphate, Abul-Abbas, Ahmad Y. al-Hassan, Alarm clock, Alexander Bain (inventor), Alexander M. Nicholson, Allan variance, Alternating current, American clock, American Institute of Physics, American Watchmakers-Clockmakers Institute, Ammonia, Anchor escapement, Ancient Greece, Ancient Greek astronomy, Ancient history, Ancient Rome, Andronicus of Cyrrhus, Archimedes, Armillary sphere, Artuqids, Asian elephant, Astrolabe, Astrology, Astron (wristwatch), Astronomical clock, Asynchronous circuit, Atmos clock, Atom, Atomic clock, Atomic electron transition, Augsburg, Automaton, Automaton clock, Babylon, Baghdad, Balance spring, Balance wheel, Balloon clock, Balmoral Castle, Banjo clock, Barrel (horology), Baselworld, Bedfordshire, Bell Labs, Big Ben, Binary clock, Binary number, Blois, ... Expand index (316 more) »
- Time measurement systems
Aaron Lufkin Dennison
Aaron Lufkin Dennison (March 6, 1812 – January 9, 1895) was an American watchmaker and businessman who founded a number of companies.
See Clock and Aaron Lufkin Dennison
Abbasid Caliphate
The Abbasid Caliphate or Abbasid Empire (translit) was the third caliphate to succeed the Islamic prophet Muhammad.
See Clock and Abbasid Caliphate
Abul-Abbas
Abul-Abbas (– 810) was an Asian elephant brought back to the Carolingian emperor Charlemagne by his diplomat Isaac the Jew.
Ahmad Y. al-Hassan
Ahmad Yousef Al-Hassan (أحمد يوسف الحسن) (June 25, 1925 – April 28, 2012) was a Palestinian/Syrian/Canadian historian of Arabic and Islamic science and technology, educated in Jerusalem, Cairo, and London with a PhD in Mechanical engineering from University College London.
See Clock and Ahmad Y. al-Hassan
Alarm clock
An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time.
Alexander Bain (inventor)
Alexander Bain (12 October 1810 – 2 January 1877) was a Scottish inventor and engineer who was first to invent and patent the electric clock.
See Clock and Alexander Bain (inventor)
Alexander M. Nicholson
Alexander M. Nicholson was an American scientist, most notable for inventing the first crystal oscillator, using a piece of Rochelle salt in 1917 while working at Bell Telephone Laboratories.
See Clock and Alexander M. Nicholson
Allan variance
The Allan variance (AVAR), also known as two-sample variance, is a measure of frequency stability in clocks, oscillators and amplifiers. Clock and Allan variance are clocks.
Alternating current
Alternating current (AC) is an electric current that periodically reverses direction and changes its magnitude continuously with time, in contrast to direct current (DC), which flows only in one direction.
See Clock and Alternating current
American clock
The term American clock refers to a style of clock design.
American Institute of Physics
The American Institute of Physics (AIP) promotes science and the profession of physics, publishes physics journals, and produces publications for scientific and engineering societies.
See Clock and American Institute of Physics
American Watchmakers-Clockmakers Institute
The American Watchmakers-Clockmakers Institute (AWCI) is a not-for-profit trade association based in the United States that is dedicated to the advancement of the modern watch industry, from which it receives a significant portion of its funding.
See Clock and American Watchmakers-Clockmakers Institute
Ammonia
Ammonia is an inorganic chemical compound of nitrogen and hydrogen with the formula.
Anchor escapement
In horology, the anchor escapement is a type of escapement used in pendulum clocks.
See Clock and Anchor escapement
Ancient Greece
Ancient Greece (Hellás) was a northeastern Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity, that comprised a loose collection of culturally and linguistically related city-states and other territories.
Ancient Greek astronomy
Ancient Greek astronomy is the astronomy written in the Greek language during classical antiquity.
See Clock and Ancient Greek astronomy
Ancient history
Ancient history is a time period from the beginning of writing and recorded human history through late antiquity.
Ancient Rome
In modern historiography, ancient Rome is the Roman civilisation from the founding of the Italian city of Rome in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD.
Andronicus of Cyrrhus
Andronicus of Cyrrhus or Andronicus Cyrrhestes (Latin; Ἀνδρόνικος Κυρρήστης, Andrónikos Kyrrhēstēs) was a Hellenized Macedonian astronomer best known for designing the Tower of the Winds in Roman Athens.
See Clock and Andronicus of Cyrrhus
Archimedes
Archimedes of Syracuse was an Ancient Greek mathematician, physicist, engineer, astronomer, and inventor from the ancient city of Syracuse in Sicily.
Armillary sphere
An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting of a spherical framework of rings, centered on Earth or the Sun, that represent lines of celestial longitude and latitude and other astronomically important features, such as the ecliptic.
See Clock and Armillary sphere
Artuqids
The Artuqid dynasty (alternatively Artukid, Ortoqid, or Ortokid;, pl.) was established in 1102 as an Anatolian Beylik (Principality) of the Seljuk Empire.
Asian elephant
The Asian elephant (Elephas maximus), also known as the Asiatic elephant, is a species of elephant distributed throughout the Indian subcontinent and Southeast Asia, from India in the west to Borneo in the east, and Nepal in the north to Sumatra in the south.
Astrolabe
An astrolabe (ἀστρολάβος,; ٱلأَسْطُرلاب; ستارهیاب) is an astronomical instrument dating to ancient times.
Astrology
Astrology is a range of divinatory practices, recognized as pseudoscientific since the 18th century, that propose that information about human affairs and terrestrial events may be discerned by studying the apparent positions of celestial objects.
Astron (wristwatch)
The Astron wristwatch, formally known as the Seiko Quartz-Astron 35SQ, was the world's first "quartz clock" wristwatch.
See Clock and Astron (wristwatch)
Astronomical clock
An astronomical clock, horologium, or orloj is a clock with special mechanisms and dials to display astronomical information, such as the relative positions of the Sun, Moon, zodiacal constellations, and sometimes major planets.
See Clock and Astronomical clock
Asynchronous circuit
Asynchronous circuit (clockless or self-timed circuit) is a sequential digital logic circuit that does not use a global clock circuit or signal generator to synchronize its components.
See Clock and Asynchronous circuit
Atmos clock
Atmos is the brand name of a mechanical torsion pendulum clock manufactured by Jaeger-LeCoultre in Switzerland which does not need to be wound manually.
Atom
Atoms are the basic particles of the chemical elements.
See Clock and Atom
Atomic clock
An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. Clock and atomic clock are clocks and time measurement systems.
Atomic electron transition
In atomic physics and chemistry, an atomic electron transition (also called an atomic transition, quantum jump, or quantum leap) is an electron changing from one energy level to another within an atom or artificial atom.
See Clock and Atomic electron transition
Augsburg
Augsburg (label) is a city in the Bavarian part of Swabia, Germany, around west of the Bavarian capital Munich.
Automaton
An automaton (automata or automatons) is a relatively self-operating machine, or control mechanism designed to automatically follow a sequence of operations, or respond to predetermined instructions.
Automaton clock
An automaton clock or automata clock is a type of striking clock featuring automatons.
Babylon
Babylon was an ancient city located on the lower Euphrates river in southern Mesopotamia, within modern-day Hillah, Iraq, about 85 kilometers (55 miles) south of modern day Baghdad.
Baghdad
Baghdad (or; translit) is the capital of Iraq and the second-largest city in the Arab and in West Asia after Tehran.
Balance spring
A balance spring, or hairspring, is a spring attached to the balance wheel in mechanical timepieces.
Balance wheel
A balance wheel, or balance, is the timekeeping device used in mechanical watches and small clocks, analogous to the pendulum in a pendulum clock.
Balloon clock
A balloon clock is a bracket clock with a waisted or balloon-shaped case.
Balmoral Castle
Balmoral Castle is a large estate house in Aberdeenshire, Scotland, and a residence of the British royal family.
Banjo clock
The banjo clock, or banjo timepiece, is an American wall clock with a banjo-shaped case.
Barrel (horology)
Used in mechanical watches and clocks, a barrel is a cylindrical metal box closed by a cover, with a ring of gear teeth around it, containing a spiral spring called the mainspring, which provides power to run the timepiece.
See Clock and Barrel (horology)
Baselworld
Baselworld Watch and Jewellery Show was a global trade show of the international watch, jewellery and gem industry, organized each spring in the city of Basel, Switzerland, at the Messeplatz.
Bedfordshire
Bedfordshire (abbreviated Beds) is a ceremonial county in the East of England.
Bell Labs
Bell Labs is an American industrial research and scientific development company credited with the development of radio astronomy, the transistor, the laser, the photovoltaic cell, the charge-coupled device (CCD), information theory, the Unix operating system, and the programming languages B, C, C++, S, SNOBOL, AWK, AMPL, and others.
Big Ben
Big Ben is the nickname for the Great Bell of the Great Clock of Westminster, and, by extension, for the clock tower itself, which stands at the north end of the Palace of Westminster in London, England.
Binary clock
A binary clock is a clock that displays the time of day in a binary format. Clock and binary clock are time measurement systems.
Binary number
A binary number is a number expressed in the base-2 numeral system or binary numeral system, a method for representing numbers that uses only two symbols for the natural numbers: typically "0" (zero) and "1" (one).
Blois
Blois is a commune and the capital city of Loir-et-Cher department, in Centre-Val de Loire, France, on the banks of the lower Loire river between Orléans and Tours.
See Clock and Blois
Bracket clock
A bracket clock is a style of antique portable table clock made in the 17th and 18th centuries.
Braille
Braille is a tactile writing system used by people who are visually impaired.
British Museum
The British Museum is a public museum dedicated to human history, art and culture located in the Bloomsbury area of London.
Bulova
Bulova is an American timepiece manufacturing company that was founded in 1875 and has been owned by Japanese multinational conglomerate Citizen Watch Co. since 2008.
See Clock and Bulova
Bury St Edmunds
Bury St Edmunds, commonly referred to locally as Bury is a cathedral and market town in the West Suffolk district, in the county of Suffolk, England.
Byzantine Empire
The Byzantine Empire, also referred to as the Eastern Roman Empire, was the continuation of the Roman Empire centered in Constantinople during Late Antiquity and the Middle Ages.
See Clock and Byzantine Empire
Caesium
Caesium (IUPAC spelling; cesium in American English) is a chemical element; it has symbol Cs and atomic number 55.
Caesium standard
The caesium standard is a primary frequency standard in which the photon absorption by transitions between the two hyperfine ground states of caesium-133 atoms is used to control the output frequency.
See Clock and Caesium standard
Caliphate
A caliphate or khilāfah (خِلَافَةْ) is a monarchical form of government (initially elective, later absolute) that originated in the 7th century Arabia, whose political identity is based on a claim of succession to the Islamic State of Muhammad and the identification of a monarch called caliph (خَلِيفَةْ) as his heir and successor.
Cambridge University Press
Cambridge University Press is the university press of the University of Cambridge.
See Clock and Cambridge University Press
Candle clock
A candle clock is a thin candle with consistently spaced marking that, when burned, indicates the passage of periods of time. Clock and candle clock are clocks.
Canonical hours
In the practice of Christianity, canonical hours mark the divisions of the day in terms of fixed times of prayer at regular intervals.
Canterbury Cathedral
Canterbury Cathedral, formally Christ Church Cathedral, Canterbury, is the cathedral of the archbishop of Canterbury, the leader of the Church of England and symbolic leader of the worldwide Anglican Communion.
See Clock and Canterbury Cathedral
Capacitor
In electrical engineering, a capacitor is a device that stores electrical energy by accumulating electric charges on two closely spaced surfaces that are insulated from each other.
Cape Town
Cape Town is the legislative capital of South Africa.
Carriage clock
A carriage clock is a small, spring-driven clock, designed for travelling, developed in the early 19th century in France.
Cartel clock
A cartel clock is a cartouche shaped clock designed to hang directly on a wall, very commonly executed in fire-gilt bronze (a.k.a. ormolu).
Casio F-91W
The Casio F-91W is a digital watch manufactured by Japanese electronics company Casio.
Cathode-ray tube
A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen.
See Clock and Cathode-ray tube
Celestial navigation
Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space or on the surface of the Earth without relying solely on estimated positional calculations, commonly known as dead reckoning.
See Clock and Celestial navigation
Chariot clock
A chariot clock is a type of mantel/table figural clock in the form of a chariot whose dial is set into the wheel or elsewhere, its origins date back to the second half of the 16th century southern Germany.
Charlemagne
Charlemagne (2 April 748 – 28 January 814) was King of the Franks from 768, King of the Lombards from 774, and Emperor, of what is now known as the Carolingian Empire, from 800, holding these titles until his death in 814.
Chess clock
A chess clock is a device that comprises two adjacent clocks with buttons to stop one clock while starting the other, so that the two clocks never run simultaneously.
Christiaan Huygens
Christiaan Huygens, Lord of Zeelhem, (also spelled Huyghens; Hugenius; 14 April 1629 – 8 July 1695) was a Dutch mathematician, physicist, engineer, astronomer, and inventor who is regarded as a key figure in the Scientific Revolution.
See Clock and Christiaan Huygens
Chronometer watch
A chronometer (χρονόμετρον, khronómetron, "time measurer") is an extraordinarily accurate mechanical timepiece, with an original focus on the needs of maritime navigation. Clock and chronometer watch are clocks.
See Clock and Chronometer watch
Chronometry
Chronometry or horology is the science studying the measurement of time and timekeeping. Chronometry enables the establishment of standard measurements of time, which have applications in a broad range of social and scientific areas. Horology usually refers specifically to the study of mechanical timekeeping devices, while chronometry is broader in scope, also including biological behaviours with respect to time (biochronometry), as well as the dating of geological material (geochronometry).
Circadian rhythm
A circadian rhythm, or circadian cycle, is a natural oscillation that repeats roughly every 24 hours.
See Clock and Circadian rhythm
Clock drift
Clock drift refers to several related phenomena where a clock does not run at exactly the same rate as a reference clock. Clock and clock drift are clocks.
Clock face
A clock face is the part of an analog clock (or watch) that displays time through the use of a flat dial with reference marks, and revolving pointers turning on concentric shafts at the center, called hands.
Clock ident
A clock ident is a form of television ident in which a clock is displayed, reading the current time, and usually alongside the logo of that particular television station.
Clock network
A clock network or clock system is a set of synchronized clocks designed to always show exactly the same time by communicating with each other. Clock and clock network are clocks.
Clock of the Long Now
The Clock of the Long Now, also called the 10,000-year clock, is a mechanical clock under construction that is designed to keep time for 10,000 years.
See Clock and Clock of the Long Now
Clock signal
In electronics and especially synchronous digital circuits, a clock signal (historically also known as logic beat) is an electronic logic signal (voltage or current) which oscillates between a high and a low state at a constant frequency and is used like a metronome to synchronize actions of digital circuits.
Clock tower
Clock towers are a specific type of structure that house a turret clock and have one or more clock faces on the upper exterior walls. Clock and clock tower are clocks.
Clockarium
The Clockarium, Museum of the Art Deco Ceramic Clock in Brussels (Le Clockarium, Musée de l'horloge Art Déco en faïence à Bruxelles; Het Clockarium, Museum van de Art Deco faienceklok te Brussel) is a museum in Schaerbeek, a municipality of Brussels, Belgium, devoted to Art Deco ceramic clocks.
Clockkeeper
A clockkeeper, sometimes seen as clock keeper, refers to a form of employment seen prevalently during Middle Age Europe involving the tracking of time and the maintaining of clocks and other timekeeping devices. Clock and clockkeeper are clocks.
Clockmaker
A clockmaker is an artisan who makes and/or repairs clocks.
Clockwork
Clockwork refers to the inner workings of either mechanical devices called clocks and watches (where it is also called the movement) or other mechanisms that work similarly, using a series of gears driven by a spring or weight.
Cognate
In historical linguistics, cognates or lexical cognates are sets of words that have been inherited in direct descent from an etymological ancestor in a common parent language.
Colgate Clock (Indiana)
The Colgate Clock, located at a former Colgate-Palmolive factory in Clarksville, Indiana, is one of the largest clocks in the world.
See Clock and Colgate Clock (Indiana)
Colgate Clock (Jersey City)
The Colgate Clock is an octagonal clock facing the Hudson River near Exchange Place in Jersey City, New Jersey.
See Clock and Colgate Clock (Jersey City)
Computer
A computer is a machine that can be programmed to automatically carry out sequences of arithmetic or logical operations (computation).
Congreve clock
A Congreve clock (also known as Congreve's Rolling Ball Clock or Oscillating Path Rolling Ball Clock) is a type of clock that uses a ball rolling along a zigzag track rather than a pendulum to regulate the time.
Conical pendulum
A conical pendulum consists of a weight (or bob) fixed on the end of a string or rod suspended from a pivot.
See Clock and Conical pendulum
Coordinated Universal Time
Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time.
See Clock and Coordinated Universal Time
Corpus Clock
The Corpus Clock, also known as the Grasshopper clock, is a large sculptural clock at street level on the outside of the Taylor Library at Corpus Christi College, University of Cambridge, in the United Kingdom, at the junction of Bene't Street and Trumpington Street, looking out over King's Parade.
Cosmo Clock 21
Cosmo Clock 21 is a 112.5 metre tall ferris wheel at the Cosmo World amusement park in the Minato Mirai 21 district of Yokohama, Japan.
Counter (digital)
In digital logic and computing, a counter is a device which stores (and sometimes displays) the number of times a particular event or process has occurred, often in relationship to a clock.
See Clock and Counter (digital)
Counterfeit watch
A counterfeit watch (or replica watch) is an unauthorised copy of an authentic watch.
See Clock and Counterfeit watch
Cox's timepiece
Cox's timepiece is a clock developed in the 1760s by James Cox.
Crystal oscillator
A crystal oscillator is an electronic oscillator circuit that uses a piezoelectric crystal as a frequency-selective element.
See Clock and Crystal oscillator
Cuckoo clock
A cuckoo clock is a type of clock, typically pendulum driven, that strikes the hours with a sound like a common cuckoo call and has an automated cuckoo bird that moves with each note.
Cuckooland Museum
The Cuckooland Museum, previously known as the Cuckoo Clock Museum, is a museum that exhibits mainly cuckoo clocks, located in Tabley, Cheshire, England.
See Clock and Cuckooland Museum
Cyrrhus (Macedonia)
Cyrrhus or Kyrros (Κύρρος), also known as Cyrius or Kyrius (Κύριος), was a town in ancient Macedonia.
See Clock and Cyrrhus (Macedonia)
Daedalus (journal)
Dædalus is a quarterly peer-reviewed academic journal that was established in 1846 as the Proceedings of the American Academy of Arts and Sciences, obtaining its current title in 1958.
See Clock and Daedalus (journal)
Daniel Quare
Daniel Quare (1648 or 1649 – 21 March 1724) was an English clockmaker and instrument maker who invented a repeating watch movement in 1680 and a portable barometer in 1695.
Date and time representation by country
Different conventions exist around the world for date and time representation, both written and spoken.
See Clock and Date and time representation by country
Day
A day is the time period of a full rotation of the Earth with respect to the Sun.
See Clock and Day
Debt clock
A debt clock is a public counter, which displays the government debt (also known as public debt or national debt) of a public corporation, usually of a state, and which visualizes the progression through an update every second.
Decimal time
Decimal time is the representation of the time of day using units which are decimally related. Clock and decimal time are time measurement systems.
Department of Defense master clock
The Department of Defense master clock is the atomic master clock to which time and frequency measurements for the United States Department of Defense are referenced.
See Clock and Department of Defense master clock
Derek J. de Solla Price
Derek John de Solla Price (22 January 1922 – 3 September 1983) was a British physicist, historian of science, and information scientist.
See Clock and Derek J. de Solla Price
Digital clock
A digital clock displays the time digitally (i.e. in numerals or other symbols), as opposed to an analogue clock.
Digital data
Digital data, in information theory and information systems, is information represented as a string of discrete symbols, each of which can take on one of only a finite number of values from some alphabet, such as letters or digits.
Direct current
Direct current (DC) is one-directional flow of electric charge.
Doll's head clock
Doll's head clocks, often known by their French name tête de poupée, were popular during the last quarter of the seventeenth century.
See Clock and Doll's head clock
Doomsday Clock
The Doomsday Clock is a symbol that represents the likelihood of a human-made global catastrophe, in the opinion of the members of the Bulletin of the Atomic Scientists. Clock and Doomsday Clock are clocks.
Drive wheel
A drive wheel is a wheel of a motor vehicle that transmits force, transforming torque into tractive force from the tires to the road, causing the vehicle to move.
Dunstable Priory
The Priory Church of St Peter with its monastery (Dunstable Priory) was founded in 1132 by Henry I for Augustinian Canons in Dunstable, Bedfordshire, England.
See Clock and Dunstable Priory
Duodecimal
The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.
Earth clock
Earth Clock is a computer program that will display a map of the Earth showing the zones where is day and where is night. Clock and Earth clock are clocks.
Edward Barlow (priest)
Edward Barlow, alias Booth (1639–1719), was an English priest and mechanician.
See Clock and Edward Barlow (priest)
Electric battery
An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections for powering electrical devices.
See Clock and Electric battery
Electric clock
An electric clock is a clock that is powered by electricity, as opposed to a mechanical clock which is powered by a hanging weight or a mainspring.
Electromagnet
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.
Electromagnetism
In physics, electromagnetism is an interaction that occurs between particles with electric charge via electromagnetic fields.
See Clock and Electromagnetism
Electron
The electron (or in nuclear reactions) is a subatomic particle with a negative one elementary electric charge.
Electronic oscillator
An electronic oscillator is an electronic circuit that produces a periodic, oscillating or alternating current (AC) signal, usually a sine wave, square wave or a triangle wave, powered by a direct current (DC) source.
See Clock and Electronic oscillator
Elephant clock
The elephant clock was a model of water clock invented by the medieval Islamic engineer Ismail al-Jazari (1136–1206).
Eli Terry
Eli Terry Sr. (April 13, 1772 – February 24, 1852) was an inventor and clockmaker in Connecticut.
Elizabeth I
Elizabeth I (7 September 153324 March 1603) was Queen of England and Ireland from 17 November 1558 until her death in 1603.
Energy level
A quantum mechanical system or particle that is bound—that is, confined spatially—can only take on certain discrete values of energy, called energy levels.
Ephemeris time
The term ephemeris time (often abbreviated ET) can in principle refer to time in association with any ephemeris (itinerary of the trajectory of an astronomical object).
Equation clock
An equation clock is a mechanical clock which includes a mechanism that simulates the equation of time, so that the user can read or calculate solar time, as would be shown by a sundial. Clock and equation clock are clocks.
Equation of time
The equation of time describes the discrepancy between two kinds of solar time.
See Clock and Equation of time
Escapement
An escapement is a mechanical linkage in mechanical watches and clocks that gives impulses to the timekeeping element and periodically releases the gear train to move forward, advancing the clock's hands.
Federation of the Swiss Watch Industry
The Federation of the Swiss Watch Industry (FH) is the Swiss watch industry's leading trade association, headquartered in Bienne, Switzerland.
See Clock and Federation of the Swiss Watch Industry
Flashlight
A flashlight (US English) or electric torch (Commonwealth English), usually shortened to torch, is a portable hand-held electric lamp.
Flip clock
A flip clock (also known as a "flap clock") is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split-flap display.
Floral clock
A floral clock, or flower clock, is a large decorative clock with the clock face formed by carpet bedding, usually found in a park or other public recreation area.
Flying pendulum clock
A flying pendulum clock is a clock that uses a flying pendulum escapement mechanism.
See Clock and Flying pendulum clock
Francis Ronalds
Sir Francis Ronalds FRS (21 February 17888 August 1873) was an English scientist and inventor, and arguably the first electrical engineer.
French Empire mantel clock
A French Empire-style mantel clock is a type of elaborately decorated mantel clock that was made in France during the Napoleonic Empire (1804–1814/15).
See Clock and French Empire mantel clock
French Revolution
The French Revolution was a period of political and societal change in France that began with the Estates General of 1789, and ended with the coup of 18 Brumaire in November 1799 and the formation of the French Consulate.
See Clock and French Revolution
Friction
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
Fusee (horology)
A fusee (from the French fusée, wire wound around a spindle) is a cone-shaped pulley with a helical groove around it, wound with a cord or chain attached to the mainspring barrel of antique mechanical watches and clocks.
See Clock and Fusee (horology)
Galileo Galilei
Galileo di Vincenzo Bonaiuti de' Galilei (15 February 1564 – 8 January 1642), commonly referred to as Galileo Galilei or simply Galileo, was an Italian astronomer, physicist and engineer, sometimes described as a polymath.
Gear
A gear or gearwheel is a rotating machine part typically used to transmit rotational motion and/or torque by means of a series of teeth that engage with compatible teeth of another gear or other part.
See Clock and Gear
Gear train
A gear train or gear set is a machine element of a mechanical system formed by mounting two or more gears on a frame such that the teeth of the gears engage.
George Graham (clockmaker)
George Graham, FRS (7 July 1673, maybe 1675 – 16 November 1751) was an English clockmaker, inventor, and geophysicist, and a Fellow of the Royal Society.
See Clock and George Graham (clockmaker)
George III
George III (George William Frederick; 4 June 173829 January 1820) was King of Great Britain and Ireland from 25 October 1760 until his death in 1820.
Germanisches Nationalmuseum
The Germanisches Nationalmuseum is a museum in Nuremberg, Germany.
See Clock and Germanisches Nationalmuseum
Giovanni Dondi dall'Orologio
Giovanni Dondi dall'Orologio (c. 1330 – 1388), also known as Giovanni de' Dondi, was an Italian physician, astronomer and mechanical engineer in Padua, now in Italy.
See Clock and Giovanni Dondi dall'Orologio
Gnomon
A gnomon is the part of a sundial that casts a shadow.
See Clock and Gnomon
Grandfather clock
A grandfather clock (also a longcase clock, tall-case clock, grandfather's clock, hall clock or floor clock) is a tall, freestanding, weight-driven pendulum clock, with the pendulum held inside the tower or waist of the case.
See Clock and Grandfather clock
Greenwich Mean Time
Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted from midnight.
See Clock and Greenwich Mean Time
Guard tour patrol system
A guard tour patrol system is a system for logging the rounds of employees in a variety of situations such as security guards patrolling property, technicians monitoring climate-controlled environments, and correctional officers checking prisoner living areas.
See Clock and Guard tour patrol system
Harmonic oscillator
In classical mechanics, a harmonic oscillator is a system that, when displaced from its equilibrium position, experiences a restoring force F proportional to the displacement x: \vec F.
See Clock and Harmonic oscillator
Harun al-Rashid
Abu Ja'far Harun ibn Muhammad al-Mahdi (Abū Ja'far Hārūn ibn Muḥammad al-Mahdī), or simply Harun ibn al-Mahdi (or 766 – 24 March 809), famously known as Harun al-Rashid (Hārūn ar-Rashīd), was the fifth Abbasid caliph of the Abbasid Caliphate, reigning from September 786 until his death in March 809.
Hertz
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second.
See Clock and Hertz
History of Athens
Athens is one of the oldest named cities in the world, having been continuously inhabited for perhaps 5,000 years.
See Clock and History of Athens
History of timekeeping devices
The history of timekeeping devices dates back to when ancient civilizations first observed astronomical bodies as they moved across the sky.
See Clock and History of timekeeping devices
Hour
An hour (symbol: h; also abbreviated hr) is a unit of time historically reckoned as of a day and defined contemporarily as exactly 3,600 seconds (SI).
See Clock and Hour
Hourglass
An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time.
House of Lords
The House of Lords is the upper house of the Parliament of the United Kingdom.
Hydraulics
Hydraulics is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids.
Incense clock
The incense clock is a timekeeping device that originated from China during the Song Dynasty (960–1279) and spread to neighboring East Asian countries such as Japan and Korea. Clock and incense clock are clocks.
Industrial Revolution
The Industrial Revolution, sometimes divided into the First Industrial Revolution and Second Industrial Revolution, was a period of global transition of the human economy towards more widespread, efficient and stable manufacturing processes that succeeded the Agricultural Revolution.
See Clock and Industrial Revolution
Integrated circuit
An integrated circuit (IC), also known as a microchip, computer chip, or simply chip, is a small electronic device made up of multiple interconnected electronic components such as transistors, resistors, and capacitors.
See Clock and Integrated circuit
Interchangeable parts
Interchangeable parts are parts (components) that are identical for practical purposes.
See Clock and Interchangeable parts
Internet
The Internet (or internet) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices.
Invention
An invention is a unique or novel device, method, composition, idea or process.
Islam
Islam (al-Islām) is an Abrahamic monotheistic religion centered on the Quran and the teachings of Muhammad, the religion's founder.
See Clock and Islam
Ismail al-Jazari
Badīʿ az-Zaman Abu l-ʿIzz ibn Ismāʿīl ibn ar-Razāz al-Jazarī (1136–1206, بَدِيعُ الزَّمانِ أَبُو العِزِّ بْنُ إسْماعِيلَ بْنِ الرَّزَّازِ الجَزَرِيّ) was a Muslim polymath: a scholar, inventor, mechanical engineer, artisan and artist from the Artuqid Dynasty of Jazira in Mesopotamia.
See Clock and Ismail al-Jazari
Isotopes of caesium
Caesium (55Cs) has 41 known isotopes, the atomic masses of these isotopes range from 112 to 152.
See Clock and Isotopes of caesium
Japanese clock
A is a mechanical clock that has been made to tell traditional Japanese time, a system in which daytime and nighttime are always divided into six periods whose lengths consequently change with the season.
Jens Olsen's World Clock
Jens Olsen's World Clock or Verdensur is an advanced astronomical clock which is displayed in Copenhagen City Hall.
See Clock and Jens Olsen's World Clock
Jewel bearing
A jewel bearing is a plain bearing in which a metal spindle turns in a jewel-lined pivot hole.
Jocelyn de Brakelond
Jocelyn or Jocelin de Brakelond or Brakelonde (Jocelinus de Brakelondia; century) was an English Benedictine monk at Bury St. Edmunds Abbey in Suffolk, England.
See Clock and Jocelyn de Brakelond
John Harrison
John Harrison (– 24 March 1776) was an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of calculating longitude while at sea.
Jost Bürgi
Jost Bürgi (also Joost, Jobst; Latinized surname Burgius or Byrgius; 28 February 1552 – 31 January 1632), active primarily at the courts in Kassel and Prague, was a Swiss clockmaker, mathematician, and writer.
Kaifeng
Kaifeng is a prefecture-level city in east-central Henan province, China.
Kanazawa Station
is a major railway station in Kanazawa, Ishikawa, Japan, operated by West Japan Railway Company (JR West), the private railway operator Hokuriku Railroad, and the third-sector operator IR Ishikawa Railway.
See Clock and Kanazawa Station
Kit-Cat Klock
The Kit-Cat Klock is an art deco novelty wall clock shaped like a grinning cat with cartoon eyes that swivel in time with its pendulum tail.
Lamport timestamp
The Lamport timestamp algorithm is a simple logical clock algorithm used to determine the order of events in a distributed computer system.
See Clock and Lamport timestamp
Lantern clock
A lantern clock is a type of antique weight-driven wall clock, shaped like a lantern. Clock and lantern clock are time measurement systems.
Latin
Latin (lingua Latina,, or Latinum) is a classical language belonging to the Italic branch of the Indo-European languages.
See Clock and Latin
Latitude
In geography, latitude is a coordinate that specifies the north–south position of a point on the surface of the Earth or another celestial body.
Le Défenseur du Temps
Le Défenseur du Temps ('The Defender of Time') is a large mechanical work of art in the form of a clock created by the French artist.
See Clock and Le Défenseur du Temps
Liang Lingzan
Liang Lingzan was a Chinese artist, astronomer, inventor, mechanical engineer and politician of the Kaiyuan era during the Tang dynasty.
Light-emitting diode
A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it.
See Clock and Light-emitting diode
Lighthouse clock
A lighthouse clock is a type of mantel clock manufactured in the U.S. from 1818 through 1830s by the American clockmaker Simon Willard, having the dial and works exposed beneath a glass dome on a tapered, cylindrical body.
See Clock and Lighthouse clock
Liquid-crystal display
A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers.
See Clock and Liquid-crystal display
List of clocks
This is a list of clocks that have attained notability because of their historical importance, accuracy, exceptional artistry, architectural value, or size.
List of international common standards
A list of international common and basic technical standards, which have been established worldwide and are related by their frequent and widespread use.
See Clock and List of international common standards
List of largest clock faces
A list of permanent working clocks with the largest faces in the world. Clock and list of largest clock faces are clocks.
See Clock and List of largest clock faces
List of largest cuckoo clocks
Several unusually large cuckoo clocks have been built and installed in different cities of the world with the aim of attracting visitors, as part of publicity of a cuckoo clock shop, or to serve as a landmark for the community and town.
See Clock and List of largest cuckoo clocks
Local mean time
Local mean time (LMT) is a form of solar time that corrects the variations of local apparent time, forming a uniform time scale at a specific longitude.
London Bridge
The name "London Bridge" refers to several historic crossings that have spanned the River Thames between the City of London and Southwark, in central London since Roman times.
Longitude
Longitude is a geographic coordinate that specifies the east–west position of a point on the surface of the Earth, or another celestial body.
Longitude rewards
The longitude rewards were the system of inducement prizes offered by the British government for a simple and practical method for the precise determination of a ship's longitude at sea.
See Clock and Longitude rewards
Lord Kelvin
William Thomson, 1st Baron Kelvin, (26 June 182417 December 1907) was a British mathematician, mathematical physicist and engineer born in Belfast.
Louis Essen
Louis Essen OBE FRS(6 September 1908 – 24 August 1997) was an English physicist whose most notable achievements were in the precise measurement of time and the determination of the speed of light.
Low Countries
The Low Countries (de Lage Landen; les Pays-Bas), historically also known as the Netherlands (de Nederlanden), is a coastal lowland region in Northwestern Europe forming the lower basin of the Rhine–Meuse–Scheldt delta and consisting today of the three modern "Benelux" countries: Belgium, Luxembourg, and the Netherlands (Nederland, which is singular).
Lunar month
In lunar calendars, a lunar month is the time between two successive syzygies of the same type: new moons or full moons.
Lunar phase
A lunar phase or Moon phase is the apparent shape of the Moon's directly sunlit portion as viewed from the Earth (because the Moon is tidally locked with the Earth, the same hemisphere is always facing the Earth).
Macedonia (ancient kingdom)
Macedonia (Μακεδονία), also called Macedon, was an ancient kingdom on the periphery of Archaic and Classical Greece, which later became the dominant state of Hellenistic Greece.
See Clock and Macedonia (ancient kingdom)
Mains electricity
Mains electricity or utility power, grid power, domestic power, and wall power, or, in some parts of Canada, hydro, is a general-purpose alternating-current (AC) electric power supply.
See Clock and Mains electricity
Mainspring
A mainspring is a spiral torsion spring of metal ribbon—commonly spring steel—used as a power source in mechanical watches, some clocks, and other clockwork mechanisms.
Mantel clock
Mantel clocks—or shelf clocks—are relatively small house clocks traditionally placed on the shelf, or mantel, above the fireplace.
Marine chronometer
A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation. Clock and marine chronometer are clocks.
See Clock and Marine chronometer
Maser
A maser is a device that produces coherent electromagnetic waves (microwaves), through amplification by stimulated emission.
See Clock and Maser
Massachusetts
Massachusetts (script), officially the Commonwealth of Massachusetts, is a state in the New England region of the Northeastern United States.
Master clock
A master clock is a precision clock that provides timing signals to synchronise slave clocks as part of a clock network. Clock and master clock are clocks.
McMaster Faculty of Engineering
The McMaster Faculty of Engineering is a faculty located at McMaster University in Hamilton, Ontario.
See Clock and McMaster Faculty of Engineering
Mechanical watch
A mechanical watch is a watch that uses a clockwork mechanism to measure the passage of time, as opposed to quartz watches which function using the vibration modes of a piezoelectric quartz tuning fork, or radio watches, which are quartz watches synchronized to an atomic clock via radio waves.
See Clock and Mechanical watch
Medieval Latin
Medieval Latin was the form of Literary Latin used in Roman Catholic Western Europe during the Middle Ages.
Mercury (element)
Mercury is a chemical element; it has symbol Hg and atomic number 80.
See Clock and Mercury (element)
Metric system
The metric system is a decimal-based system of measurement.
Metrology
Metrology is the scientific study of measurement.
Microprocessor
A microprocessor is a computer processor for which the data processing logic and control is included on a single integrated circuit (IC), or a small number of ICs.
Microwave
Microwave is a form of electromagnetic radiation with wavelengths shorter than other radio waves (as originally discovered) but longer than infrared waves.
Microwave cavity
A microwave cavity or radio frequency cavity (RF cavity) is a special type of resonator, consisting of a closed (or largely closed) metal structure that confines electromagnetic fields in the microwave or RF region of the spectrum.
See Clock and Microwave cavity
Middle Dutch
Middle Dutch is a collective name for a number of closely related West Germanic dialects whose ancestor was Old Dutch.
Middle English
Middle English (abbreviated to ME) is a form of the English language that was spoken after the Norman Conquest of 1066, until the late 15th century.
Millennium
A millennium is a period of one thousand years, sometimes called a '''kiloannum''' (ka), or kiloyear (ky).
Mora clock
Gustavian Mora clocks are a type of longcase clock which were made in, and derived their name from, the town of Mora in Dalarna province, Sweden.
Moveable feast
A moveable feast is an observance in a Christian liturgical calendar which occurs on different dates in different years.
Movement (clockwork)
In horology, a movement, also known as a caliber or calibre (British English), is the mechanism of a watch or timepiece, as opposed to the case, which encloses and protects the movement, and the face, which displays the time.
See Clock and Movement (clockwork)
Musical clock
A musical clock is a clock that marks the hours of the day with a musical tune.
Nasreddin
Nasreddin or Nasreddin Hodja (other variants include: Mullah Nasreddin Hodja, Nasruddin Hodja, Mullah Nasruddin, Mullah Nasriddin, Khoja Nasriddin) (1208–1285) is a character in the folklore of the Muslim world from the Balkans to China, and a hero of humorous short stories and satirical anecdotes.
National Association of Watch and Clock Collectors
The National Association of Watch & Clock Collectors, Inc.
See Clock and National Association of Watch and Clock Collectors
National Institute of Standards and Technology
The National Institute of Standards and Technology (NIST) is an agency of the United States Department of Commerce whose mission is to promote American innovation and industrial competitiveness.
See Clock and National Institute of Standards and Technology
National Museum of Natural Science
The National Museum of Natural Science is a national museum in North District, Taichung, Taiwan.
See Clock and National Museum of Natural Science
National Physical Laboratory (United Kingdom)
The National Physical Laboratory (NPL) is the national measurement standards laboratory of the United Kingdom.
See Clock and National Physical Laboratory (United Kingdom)
Network Time Protocol
The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks.
See Clock and Network Time Protocol
Nixie tube
A Nixie tube, or cold cathode display, is an electronic device used for displaying numerals or other information using glow discharge.
Nocturnal (instrument)
A nocturnal is an instrument used to determine the local time based on the position of a star in the night sky relative to the pole star.
See Clock and Nocturnal (instrument)
Noon Gun
The Noon Gun has been a historic time signal in Cape Town, South Africa since 1806.
Norwich Cathedral astronomical clock
The 14th-century Norwich Cathedral astronomical clock was the earliest example of a large clock with automata in England, and the first to possess an astronomical dial. It replaced an earlier 13th-century "old clock", one of the earliest weight-driven mechanical timekeepers made in England.
See Clock and Norwich Cathedral astronomical clock
Nuclear magnetic resonance
Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a strong constant magnetic field are perturbed by a weak oscillating magnetic field (in the near field) and respond by producing an electromagnetic signal with a frequency characteristic of the magnetic field at the nucleus.
See Clock and Nuclear magnetic resonance
Nuremberg
Nuremberg (Nürnberg; in the local East Franconian dialect: Nämberch) is the largest city in Franconia, the second-largest city in the German state of Bavaria, and its 544,414 (2023) inhabitants make it the 14th-largest city in Germany.
Observatory chronometer
An observatory chronometer is a timepiece that has passed stringent testing and a slate of accuracy tests. Clock and observatory chronometer are clocks.
See Clock and Observatory chronometer
Oil-lamp clock
Oil-lamp clocks are clocks consisting of a graduated glass reservoir to hold oil - usually whale oil, which burned cleanly and evenly - supplying the fuel for a built-in lamp. Clock and oil-lamp clock are clocks.
Old French
Old French (franceis, françois, romanz; ancien français) was the language spoken in most of the northern half of France approximately between the late 8th and the mid-14th century.
Old Irish
Old Irish, also called Old Gaelic (Goídelc, Ogham script: ᚌᚑᚔᚇᚓᚂᚉ; Sean-Ghaeilge; Seann-Ghàidhlig; Shenn Yernish or Shenn Ghaelg), is the oldest form of the Goidelic/Gaelic language for which there are extensive written texts.
Oscillation
Oscillation is the repetitive or periodic variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states.
Oxford University Press
Oxford University Press (OUP) is the publishing house of the University of Oxford.
See Clock and Oxford University Press
Padua
Padua (Padova; Pàdova, Pàdoa or Pàoa) is a city and comune (municipality) in Veneto, northern Italy, and the capital of the province of Padua.
See Clock and Padua
Paul-Jacques Curie
Jacques Curie (29 October 1855 – 19 February 1941) was a French physicist and professor of mineralogy at the University of Montpellier.
See Clock and Paul-Jacques Curie
Pendulum
A pendulum is a device made of a weight suspended from a pivot so that it can swing freely.
Pendulum clock
A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. Clock and pendulum clock are clocks.
Peter Henlein
Peter Henlein (also spelled Henle or Hele) (1485 - August 1542), a locksmith and clockmaker of Nuremberg, Germany, is often considered the inventor of the watch.
Phase-locked loop
A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is fixed relative to the phase of an input signal.
See Clock and Phase-locked loop
Physical Review Letters
Physical Review Letters (PRL), established in 1958, is a peer-reviewed, scientific journal that is published 52 times per year by the American Physical Society.
See Clock and Physical Review Letters
Pierre Curie
Pierre Curie (15 May 1859 – 19 April 1906) was a French physicist, a pioneer in crystallography, magnetism, piezoelectricity, and radioactivity.
Piezoelectricity
Piezoelectricity is the electric charge that accumulates in certain solid materials—such as crystals, certain ceramics, and biological matter such as bone, DNA, and various proteins—in response to applied mechanical stress.
See Clock and Piezoelectricity
Pitch clock
A pitch clock (also known as a pitch timer) is used in various baseball leagues to limit the amount of time a pitcher uses before he throws the ball to the hitter and/or limit the amount of time the hitter uses before he is prepared to hit. Clock and pitch clock are time measurement systems.
Play clock
A play clock, also called a delay-of-game timer, is a countdown clock intended to speed up the pace of the game in gridiron football. Clock and play clock are time measurement systems.
Pocket watch
A pocket watch is a watch that is made to be carried in a pocket, as opposed to a wristwatch, which is strapped to the wrist.
Polymath
A polymath (lit; lit) or polyhistor (lit) is an individual whose knowledge spans many different subjects, known to draw on complex bodies of knowledge to solve specific problems.
Pope Sylvester II
Pope Sylvester II (Silvester II; – 12 May 1003), originally known as Gerbert of Aurillac, was a scholar and teacher who served as the bishop of Rome and ruled the Papal States from 999 to his death.
See Clock and Pope Sylvester II
Portable media player
A portable media player (PMP) or digital audio player (DAP) is a portable consumer electronics device capable of storing and playing digital media such as audio, images, and video files.
See Clock and Portable media player
Post-classical history
In world history, post-classical history refers to the period from about 500 CE to 1500 CE, roughly corresponding to the European Middle Ages.
See Clock and Post-classical history
Prime meridian
A prime meridian is an arbitrarily-chosen meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°.
Primum Mobile
In classical, medieval, and Renaissance astronomy, the Primum Mobile (Latin: "first movable") was the outermost moving sphere in the geocentric model of the universe.
Projection clock
A projection clock (also called ceiling clock) is an analogue or digital clock equipped with a projector that creates an enlarged image of the clock face or display on any surface usable as a projection screen, most often the ceiling. Clock and projection clock are clocks.
See Clock and Projection clock
Projector
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen.
Pulley
A pulley is a wheel on an axle or shaft enabling a taut cable or belt passing over the wheel to move and change direction, or transfer power between itself and a shaft.
See Clock and Pulley
Pulsar clock
A pulsar clock is a clock which depends on counting radio pulses emitted by pulsars.
Q factor
In physics and engineering, the quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is.
Quantum logic clock
A quantum clock is a type of atomic clock with laser cooled single ions confined together in an electromagnetic ion trap.
See Clock and Quantum logic clock
Quartz
Quartz is a hard, crystalline mineral composed of silica (silicon dioxide).
See Clock and Quartz
Quartz clock
Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time.
Queen Victoria
Victoria (Alexandrina Victoria; 24 May 1819 – 22 January 1901) was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death in 1901.
Radio clock
A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock. Clock and radio clock are clocks.
Railroad chronometer
A railroad chronometer or railroad standard watch is a specialized timepiece that once was crucial for safe and correct operation of trains in many countries.
See Clock and Railroad chronometer
Real-time clock
A real-time clock (RTC) is an electronic device (most often in the form of an integrated circuit) that measures the passage of time. Clock and real-time clock are clocks.
Remontoire
In mechanical horology, a remontoire (from the French remonter, meaning 'to wind') is a small secondary source of power, a weight or spring, which runs the timekeeping mechanism and is itself periodically rewound by the timepiece's main power source, such as a mainspring.
Repeater (horology)
A repeater is a complication in a mechanical watch or clock that chimes the hours and often minutes at the press of a button.
See Clock and Repeater (horology)
Resonance
In physics, resonance refers to a wide class of phenomena that arise as a result of matching temporal or spatial periods of oscillatory objects.
Resonator
A resonator is a device or system that exhibits resonance or resonant behavior.
Richard of Wallingford
Richard of Wallingford (1292–1336) was an English mathematician, astronomer, horologist, and cleric who made major contributions to astronomy and horology while serving as abbot of St Albans Abbey in Hertfordshire.
See Clock and Richard of Wallingford
Robert Hooke
Robert Hooke (18 July 16353 March 1703) was an English polymath who was active as a physicist ("natural philosopher"), astronomer, geologist, meteorologist and architect.
Rockwell Automation Headquarters and Allen-Bradley Clock Tower
The Rockwell Automation Headquarters is an office building located in Milwaukee, Wisconsin.
See Clock and Rockwell Automation Headquarters and Allen-Bradley Clock Tower
Rolling ball clock
A rolling ball clock is a clock which displays time by means of balls and rails.
See Clock and Rolling ball clock
Romance languages
The Romance languages, also known as the Latin or Neo-Latin languages, are the languages that are directly descended from Vulgar Latin.
See Clock and Romance languages
Rood screen
The rood screen (also choir screen, chancel screen, or jubé) is a common feature in late medieval church architecture.
Rota Fortunae
In medieval and ancient philosophy, the Wheel of Fortune or Rota Fortunae is a symbol of the capricious nature of Fate.
Rotor (electric)
The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator.
See Clock and Rotor (electric)
Routledge
Routledge is a British multinational publisher.
Royal Observatory, Greenwich
The Royal Observatory, Greenwich (ROG; known as the Old Royal Observatory from 1957 to 1998, when the working Royal Greenwich Observatory, RGO, temporarily moved south from Greenwich to Herstmonceux) is an observatory situated on a hill in Greenwich Park in south east London, overlooking the River Thames to the north.
See Clock and Royal Observatory, Greenwich
Rubik's Clock
The Rubik's Clock is a mechanical puzzle invented and patented by Christopher C. Wiggs and Christopher J. Taylor.
Salisbury Cathedral clock
The Salisbury Cathedral clock is a large iron-framed tower clock without a dial, in Salisbury Cathedral, England.
See Clock and Salisbury Cathedral clock
Samsung Galaxy
Samsung Galaxy (stylized as SΛMSUNG Galaxy since 2015 (except Japan where it omits the Samsung branding), previously stylized as Samsung GALAXY; abbreviated as SG) is a series of computing and Android mobile computing devices that are designed, manufactured and marketed by Samsung Electronics since 29 June 2009.
Sand
Sand is a granular material composed of finely divided mineral particles.
See Clock and Sand
Satellite navigation
A satellite navigation or satnav system is a system that uses satellites to provide autonomous geopositioning.
See Clock and Satellite navigation
Second
The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60.
See Clock and Second
Seiko
, commonly known as Seiko, is a Japanese maker of watches, clocks, electronic devices, semiconductors, jewelry, and optical products.
See Clock and Seiko
Semiconductor device
A semiconductor device is an electronic component that relies on the electronic properties of a semiconductor material (primarily silicon, germanium, and gallium arsenide, as well as organic semiconductors) for its function.
See Clock and Semiconductor device
Sens Cathedral
Sens Cathedral (Cathédrale Saint-Étienne de Sens) is a Catholic cathedral in Sens in Burgundy, eastern France.
Shot clock
A shot clock is a countdown timer used in a variety of games and sports, indicating a set amount of time that a team may possess the object of play before attempting to score a goal. Clock and shot clock are time measurement systems.
Singing bird box
A singing bird box (boîte à oiseau chanteur in French) is a box, usually rectangular-shaped, which contains within a miniature automaton singing bird concealed below an oval lid and activated by means of an operating lever.
See Clock and Singing bird box
Skeleton clock
A skeleton clock is any clock or wristwatch, though typically mechanical in nature, in which the parts that usually conceal the inner workings of the mechanism have been removed or significantly modified so as to display these inner parts. Clock and skeleton clock are clocks.
Slave clock
In telecommunication and horology, a slave clock is a clock that depends on another clock, the master clock. Clock and slave clock are clocks.
Solar time
Solar time is a calculation of the passage of time based on the position of the Sun in the sky.
Song dynasty
The Song dynasty was an imperial dynasty of China that ruled from 960 to 1279.
Speaking clock
A speaking clock or talking clock is a live or recorded human voice service, usually accessed by telephone, that gives the correct time. Clock and speaking clock are clocks.
Speech synthesis
Speech synthesis is the artificial production of human speech.
See Clock and Speech synthesis
Spring Drive
Spring Drive is a name given to a series of watch movements produced by Epson in Shiojiri.
Sprocket
A sprocket, sprocket-wheel or chainwheel is a profiled wheel with teeth that mesh with a chain, rack or other perforated or indented material.
St Albans
St Albans is a cathedral city in Hertfordshire, England, east of Hemel Hempstead and west of Hatfield, north-west of London, south-west of Welwyn Garden City and south-east of Luton.
Stackfreed
A stackfreed is a simple spring-loaded cam mechanism used in some of the earliest antique spring-driven clocks and watches to even out the force of the mainspring, to improve timekeeping accuracy.
Steam clock
A steam clock is a clock which is fully or partially powered by a steam engine.
Stepper motor
A stepper motor, also known as step motor or stepping motor,Clarence W. de Silva.
Stopwatch
A stopwatch is a timepiece designed to measure the amount of time that elapses between its activation and deactivation.
Striking clock
A striking clock is a clock that sounds the hours audibly on a bell, gong, or other audible device. Clock and striking clock are clocks.
Su Song
Su Song (1020–1101), courtesy name Zirong, was a Chinese polymathic scientist and statesman.
Sundial
A sundial is a horological device that tells the time of day (referred to as civil time in modern usage) when direct sunlight shines by the apparent position of the Sun in the sky. Clock and sundial are clocks.
Synchronous motor
A synchronous electric motor is an AC electric motor in which, at steady state, the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integer number of AC cycles.
See Clock and Synchronous motor
System time
In computer science and computer programming, system time represents a computer system's notion of the passage of time.
Taichung
Taichung (Wade–Giles:, pinyin: Táizhōng), officially Taichung City, is a special municipality in central Taiwan.
Taiwan
Taiwan, officially the Republic of China (ROC), is a country in East Asia.
See Clock and Taiwan
Talking clock
A talking clock (also called a speaking clock and an auditory clock) is a timekeeping device that presents the time as sounds. Clock and talking clock are clocks.
Tally stick
A tally stick (or simply tally) was an ancient memory aid device used to record and document numbers, quantities and messages.
Tang dynasty
The Tang dynasty (唐朝), or the Tang Empire, was an imperial dynasty of China that ruled from 618 to 907, with an interregnum between 690 and 705.
Technical standard
A technical standard is an established norm or requirement for a repeatable technical task which is applied to a common and repeated use of rules, conditions, guidelines or characteristics for products or related processes and production methods, and related management systems practices.
See Clock and Technical standard
The Hague
The Hague is the capital city of the South Holland province of the Netherlands.
Thomas Tompion
Thomas Tompion, FRS (1639–1713) was an English clockmaker, watchmaker and mechanician who is still regarded to this day as the "Father of English Clockmaking".
Tide clock
A tide clock is a specially designed clock that keeps track of the Moon's apparent motion around the Earth. Clock and tide clock are clocks.
Time
Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, and into the future.
See Clock and Time
Time ball
A time ball or timeball is a time-signalling device.
Time bomb
A time bomb (or a timebomb, time-bomb) is a bomb whose detonation is triggered by a timer.
Time clock
A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees (or those on flexi-time) at a place of business. Clock and time clock are clocks.
Time server
A time server is a server computer that reads the actual time from a reference clock and distributes this information to its clients using a computer network. Clock and time server are time measurement systems.
Time signal
A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day.
Time zone
A time zone is an area which observes a uniform standard time for legal, commercial and social purposes.
Time-to-digital converter
In electronic instrumentation and signal processing, a time-to-digital converter (TDC) is a device for recognizing events and providing a digital representation of the time they occurred.
See Clock and Time-to-digital converter
Timer
A timer or countdown timer is a type of clock that starts from a specified time duration and stops when reaching 00:00.
See Clock and Timer
Torsion pendulum clock
A torsion pendulum clock, more commonly known as an anniversary clock or 400-day clock, is a mechanical clock which keeps time with a mechanism called a torsion pendulum.
See Clock and Torsion pendulum clock
Tower of the Winds
The Tower of the Winds, also known by other names, is an octagonal Pentelic marble tower in the Roman Agora in Athens, named after the eight large reliefs of wind gods around its top.
See Clock and Tower of the Winds
Track and field
Athletics (or track and field in the United States) is a sport that includes athletic contests based on running, jumping, and throwing skills.
Tuning fork
A tuning fork is an acoustic resonator in the form of a two-pronged fork with the prongs (''tines'') formed from a U-shaped bar of elastic metal (usually steel).
Turret clock
A turret clock or tower clock is a clock designed to be mounted high in the wall of a building, usually in a clock tower, in public buildings such as churches, university buildings, and town halls. Clock and turret clock are clocks.
Tycho Brahe
Tycho Brahe (born Tyge Ottesen Brahe,; 14 December 154624 October 1601), generally called Tycho for short, was a Danish astronomer of the Renaissance, known for his comprehensive and unprecedentedly accurate astronomical observations.
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of the continental mainland.
Vacuum fluorescent display
A vacuum fluorescent display (VFD) is a display device once commonly used on consumer electronics equipment such as video cassette recorders, car radios, and microwave ovens.
See Clock and Vacuum fluorescent display
Vacuum tube
A vacuum tube, electron tube, valve (British usage), or tube (North America) is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
Verge escapement
The verge (or crown wheel) escapement is the earliest known type of mechanical escapement, the mechanism in a mechanical clock that controls its rate by allowing the gear train to advance at regular intervals or 'ticks'.
See Clock and Verge escapement
Videocassette recorder
A videocassette recorder (VCR) or video recorder is an electromechanical device that records analog audio and analog video from broadcast television or other AV sources and can play back the recording after rewinding.
See Clock and Videocassette recorder
Vitreous enamel
Vitreous enamel, also called porcelain enamel, is a material made by fusing powdered glass to a substrate by firing, usually between.
Walter Guyton Cady
Walter Guyton Cady (December 10, 1874 – December 9, 1974) was a noted American physicist and electrical engineer.
See Clock and Walter Guyton Cady
Waltham Watch Company
The Waltham Watch Company, also known as the American Waltham Watch Co. and the American Watch Co., was a company that produced about 40 million watches, clocks, speedometers, compasses, time delay fuses, and other precision instruments in the United States of America between 1850 and 1957.
See Clock and Waltham Watch Company
Watch
A watch is a portable timepiece intended to be carried or worn by a person.
See Clock and Watch
Watchmaker
A watchmaker is an artisan who makes and repairs watches.
Water clock
A water clock or clepsydra is a timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount of liquid can then be measured. Clock and water clock are time measurement systems.
Wheel train
In horology, a wheel train (or just train) is the gear train of a mechanical watch or clock.
William IV
William IV (William Henry; 21 August 1765 – 20 June 1837) was King of the United Kingdom of Great Britain and Ireland and King of Hanover from 26 June 1830 until his death in 1837.
World clock
A world clock is a clock which displays the time for various cities around the world. Clock and world clock are clocks.
Year
A year is the time taken for astronomical objects to complete one orbit.
See Clock and Year
Yi Xing
Yi Xing (683–727), born Zhang Sui, was a Chinese astronomer, Buddhist monk, inventor, mathematician, mechanical engineer, and philosopher during the Tang dynasty.
Ytterbium
Ytterbium is a chemical element; it has symbol Yb and atomic number 70.
Zhang Sixun
Zhang Sixun (fl. 10th century) was a Chinese astronomer and mechanical engineer from Bazhong, Sichuan during the early Song dynasty (960–1279 AD).
12-hour clock
The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin, translating to "before midday") and p.m. (from Latin, translating to "after midday"). Clock and 12-hour clock are time measurement systems.
24-hour analog dial
Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution).
See Clock and 24-hour analog dial
24-hour clock
The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. Clock and 24-hour clock are time measurement systems.
See also
Time measurement systems
- 12-hour clock
- 24-hour clock
- Atomic clock
- Binary clock
- Byzantine time
- Catalan time system
- Clock
- Decimal time
- Hexadecimal time
- ISO 8601
- Italian six-hour clock
- Lantern clock
- Metric time
- Microbrand watches
- Muhurta
- New Earth Time
- Pitch clock
- Play clock
- Relative hour
- Roman timekeeping
- Ship's bell
- Shot clock
- Shot timer
- Swatch Internet Time
- Thai six-hour clock
- Time line (basketball)
- Time of flight
- Time server
- Traditional Chinese timekeeping
- Unix time
- Watchkeeping
- Water clock
References
Also known as An Analog Clock, Analog Clocks, Analog clock, Analogue clock, Ancient ways of telling time, Chronometer, Chronometers, Chronometric, Clock design, Clock/calendar, Clocks, Clocks and Watches, Game clock (sports), Garage clock, Mechanical clock, Timekeeper (instrument), Timekeeping device, Timepiece, Timepieces, Wall clock.
, Bracket clock, Braille, British Museum, Bulova, Bury St Edmunds, Byzantine Empire, Caesium, Caesium standard, Caliphate, Cambridge University Press, Candle clock, Canonical hours, Canterbury Cathedral, Capacitor, Cape Town, Carriage clock, Cartel clock, Casio F-91W, Cathode-ray tube, Celestial navigation, Chariot clock, Charlemagne, Chess clock, Christiaan Huygens, Chronometer watch, Chronometry, Circadian rhythm, Clock drift, Clock face, Clock ident, Clock network, Clock of the Long Now, Clock signal, Clock tower, Clockarium, Clockkeeper, Clockmaker, Clockwork, Cognate, Colgate Clock (Indiana), Colgate Clock (Jersey City), Computer, Congreve clock, Conical pendulum, Coordinated Universal Time, Corpus Clock, Cosmo Clock 21, Counter (digital), Counterfeit watch, Cox's timepiece, Crystal oscillator, Cuckoo clock, Cuckooland Museum, Cyrrhus (Macedonia), Daedalus (journal), Daniel Quare, Date and time representation by country, Day, Debt clock, Decimal time, Department of Defense master clock, Derek J. de Solla Price, Digital clock, Digital data, Direct current, Doll's head clock, Doomsday Clock, Drive wheel, Dunstable Priory, Duodecimal, Earth clock, Edward Barlow (priest), Electric battery, Electric clock, Electromagnet, Electromagnetism, Electron, Electronic oscillator, Elephant clock, Eli Terry, Elizabeth I, Energy level, Ephemeris time, Equation clock, Equation of time, Escapement, Federation of the Swiss Watch Industry, Flashlight, Flip clock, Floral clock, Flying pendulum clock, Francis Ronalds, French Empire mantel clock, French Revolution, Friction, Fusee (horology), Galileo Galilei, Gear, Gear train, George Graham (clockmaker), George III, Germanisches Nationalmuseum, Giovanni Dondi dall'Orologio, Gnomon, Grandfather clock, Greenwich Mean Time, Guard tour patrol system, Harmonic oscillator, Harun al-Rashid, Hertz, History of Athens, History of timekeeping devices, Hour, Hourglass, House of Lords, Hydraulics, Incense clock, Industrial Revolution, Integrated circuit, Interchangeable parts, Internet, Invention, Islam, Ismail al-Jazari, Isotopes of caesium, Japanese clock, Jens Olsen's World Clock, Jewel bearing, Jocelyn de Brakelond, John Harrison, Jost Bürgi, Kaifeng, Kanazawa Station, Kit-Cat Klock, Lamport timestamp, Lantern clock, Latin, Latitude, Le Défenseur du Temps, Liang Lingzan, Light-emitting diode, Lighthouse clock, Liquid-crystal display, List of clocks, List of international common standards, List of largest clock faces, List of largest cuckoo clocks, Local mean time, London Bridge, Longitude, Longitude rewards, Lord Kelvin, Louis Essen, Low Countries, Lunar month, Lunar phase, Macedonia (ancient kingdom), Mains electricity, Mainspring, Mantel clock, Marine chronometer, Maser, Massachusetts, Master clock, McMaster Faculty of Engineering, Mechanical watch, Medieval Latin, Mercury (element), Metric system, Metrology, Microprocessor, Microwave, Microwave cavity, Middle Dutch, Middle English, Millennium, Mora clock, Moveable feast, Movement (clockwork), Musical clock, Nasreddin, National Association of Watch and Clock Collectors, National Institute of Standards and Technology, National Museum of Natural Science, National Physical Laboratory (United Kingdom), Network Time Protocol, Nixie tube, Nocturnal (instrument), Noon Gun, Norwich Cathedral astronomical clock, Nuclear magnetic resonance, Nuremberg, Observatory chronometer, Oil-lamp clock, Old French, Old Irish, Oscillation, Oxford University Press, Padua, Paul-Jacques Curie, Pendulum, Pendulum clock, Peter Henlein, Phase-locked loop, Physical Review Letters, Pierre Curie, Piezoelectricity, Pitch clock, Play clock, Pocket watch, Polymath, Pope Sylvester II, Portable media player, Post-classical history, Prime meridian, Primum Mobile, Projection clock, Projector, Pulley, Pulsar clock, Q factor, Quantum logic clock, Quartz, Quartz clock, Queen Victoria, Radio clock, Railroad chronometer, Real-time clock, Remontoire, Repeater (horology), Resonance, Resonator, Richard of Wallingford, Robert Hooke, Rockwell Automation Headquarters and Allen-Bradley Clock Tower, Rolling ball clock, Romance languages, Rood screen, Rota Fortunae, Rotor (electric), Routledge, Royal Observatory, Greenwich, Rubik's Clock, Salisbury Cathedral clock, Samsung Galaxy, Sand, Satellite navigation, Second, Seiko, Semiconductor device, Sens Cathedral, Shot clock, Singing bird box, Skeleton clock, Slave clock, Solar time, Song dynasty, Speaking clock, Speech synthesis, Spring Drive, Sprocket, St Albans, Stackfreed, Steam clock, Stepper motor, Stopwatch, Striking clock, Su Song, Sundial, Synchronous motor, System time, Taichung, Taiwan, Talking clock, Tally stick, Tang dynasty, Technical standard, The Hague, Thomas Tompion, Tide clock, Time, Time ball, Time bomb, Time clock, Time server, Time signal, Time zone, Time-to-digital converter, Timer, Torsion pendulum clock, Tower of the Winds, Track and field, Tuning fork, Turret clock, Tycho Brahe, United Kingdom, Vacuum fluorescent display, Vacuum tube, Verge escapement, Videocassette recorder, Vitreous enamel, Walter Guyton Cady, Waltham Watch Company, Watch, Watchmaker, Water clock, Wheel train, William IV, World clock, Year, Yi Xing, Ytterbium, Zhang Sixun, 12-hour clock, 24-hour analog dial, 24-hour clock.