Magnetic correcting device - aircraft compass

Magnetic correcting device
Brass, corrector box, contains two independent pairs of magnets operated by level gearing inside box, which are rotated by turning operating heads with a special key.
Brass strap 9.8cm in length fitted to base of box for securing box in position.

Object Details

ID: ACO0374
Type: Magnetic correcting device - aircraft compass
Display location: Not on display
Creator: Chaffer, C.; Shaw, R. E. Chaffer, C.
Date made: 1931
Credit: National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Measurements: Overall: 30 mm x 97 mm x 68 mm