Liquid compass - aircraft

Liquid compass - spider compass
Card: Spider with eight arms and thin clear mica circular. Four arms marked 0, 1, 2, 3. Other four arms are bent to create damper effect. No markings on mica. dome at centre with cup and spike.
Needle: Six needles in two sets of three. Length 1.25" (3.1cm)

Object Details

ID: ACO0290
Type: Liquid compass - aircraft
Display location: Not on display
Creator: Unknown
Date made: Unknown
Credit: National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Measurements: Overall: 25 mm; Diameter: 92 mm