Liquid compass - submarine

Liquid compass with a wooden box. For use in submarine projector binnacle.

Bowl: Grey painted brass, filler plug at side, expansion chamber at base incorporated with glazed bottom of bowl. Inside of bowl painted white with lubber mark carried on a large black metal frame attached to the side. Mounted in grey painted brass gimbal ring 9.5" (24.1 cm) dia.

Card: Diameter 3.25" (8.2 cm) Black painted mica with clear markings, graduated quadrantally in degrees and to 360 degrees. Attached to black painted float at centre.

Needle: 2 x 2.0" (5.1 cm) of circular section mounted below float.

Pivot: Black metal pivot stem, secured at centre of bridge mounted across centre of bowl, carries a steel pivot point which engages in jewelled conical cap at centre of float.

O.A. height 3.15" (8.0 cm)

In a fitted wooden carrying case 10.0" x 10.0" x 5.5" (25.4 x 25.4 x 14.0 cm)

Object Details

ID: ACO1098
Type: Liquid compass - submarine
Display location: Not on display
Creator: Unknown
Date made: circa 1939
Credit: National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Measurements: Overall: 76 mm; Diameter: 245 mm