HMS Diana was a D-class destroyer of the Royal Navy.
HMS H49 was a British H-class submarine built by William Beardmore and Company, Dalmuir.
HMS Inconstant was an I-class destroyer laid down for the Turkish Navy, but was purchased by the Royal Navy in 1939.
The Nelson H-44 is an American single ignition, four-cylinder, horizontally opposed, direct drive, two-stroke aircraft engine that was developed by the Nelson Engine Company for use in motorgliders.
Strabismus, also known as crossed eyes, is a condition in which the eyes do not properly align with each other when looking at an object.