Liquid compass - aircraft

Liquid compass
Card: Thin metal strip marked to four cardinal points and 3, 6, 12, 15, 21, 24, 30, 33. Has cap at centre with spike. Has four struts.
Needle: Two needles slung beneath card.
Pivot: Stalk and cup.

Object Details

ID: ACO0309
Type: Liquid compass - aircraft
Display location: Not on display
Creator: Royal Aircraft Factory
Date made: 1917
Credit: National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Measurements: Overall: 80 mm; Diameter: 105 mm
Parts: Liquid compass - aircraft