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15 relations: Barr and Stroud, Dazzle camouflage, Differential (mechanical device), Heliometer, Laser rangefinder, National Defense Research Committee, Parallax, Pentaprism, Periscope, Photography, Rangefinder, Rangefinder camera, Stadiametric rangefinding, Thermal expansion, Triangulation.
Barr and Stroud
Barr & Stroud Limited was a pioneering Glasgow optical engineering firm.
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Dazzle camouflage
Dazzle camouflage, also known as razzle dazzle (in the U.S.) or dazzle painting, was a family of ship camouflage used extensively in World War I, and to a lesser extent in World War II and afterwards.
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Differential (mechanical device)
A differential is a gear train with three shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others, or a fixed multiple of that average.
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Heliometer
A heliometer (from Greek ἥλιος hḗlios "sun" and measure) is an instrument originally designed for measuring the variation of the sun's diameter at different seasons of the year, but applied now to the modern form of the instrument which is capable of much wider use.
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Laser rangefinder
A laser rangefinder is a rangefinder that uses a laser beam to determine the distance to an object.
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National Defense Research Committee
The National Defense Research Committee (NDRC) was an organization created "to coordinate, supervise, and conduct scientific research on the problems underlying the development, production, and use of mechanisms and devices of warfare" in the United States from June 27, 1940, until June 28, 1941.
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Parallax
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
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Pentaprism
A pentaprism is a five-sided reflecting prism used to deviate a beam of light by a constant 90°, even if the entry beam is not at 90° to the prism.
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Periscope
A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position.
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Photography
Photography is the science, art, application and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film.
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Rangefinder
A rangefinder is a device that measures distance from the observer to a target, in a process called ranging.
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Rangefinder camera
A rangefinder camera is a camera fitted with a rangefinder, typically a split-image rangefinder: a range-finding focusing mechanism allowing the photographer to measure the subject distance and take photographs that are in sharp focus.
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Stadiametric rangefinding
Stadiametric rangefinding, or the stadia method is a technique of measuring distances with a telescopic instrument.
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Thermal expansion
Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature.
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Triangulation
In trigonometry and geometry, triangulation is the process of determining the location of a point by forming triangles to it from known points.
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