Bearing Plate

A heavy brass ring with a fixed diameter. The ring is graduated both in degrees, quadrantally, and to1/4 points. The edge is marked to points. The sights are attached to a moving diameter. The back sight consists of a plate with a slit and the fore sight an open arch and wire.

Object Details

ID: ACO0496
Type: Bearing Plate
Display location: Not on display
Creator: Unknown
Date made: circa 1918
Credit: National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Measurements: Overall: 40 mm; Diameter: 200 mm