Dry compass

Card- Mica covered with paper. White with black and white markings, graduated to 1/4 points graduated quadrantally in degrees.
Needle- Two edge bar needles 7.5" length of rolled and hammered clock spring steel, arranged in lozenge form with their ends riveted together.
Pivot-Inverted type, mounted in a metal dome secured to centre of card.

Object Details

ID: ACO0937
Type: Dry compass
Display location: Not on display
Creator: Robinson, Thomas Charles; Robinson
Date made: 1837-1840; 1837-40
Credit: National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Measurements: Overall: 40 mm; Diameter: 190 mm