Magnetic correcting device - aircraft compass

Magnetic correcting device
Aluminium, painted grey, circular box. Has fore and aft and athwartships adjusters and two brass brackets.

Object Details

ID: ACO0373
Type: Magnetic correcting device - aircraft compass
Display location: Not on display
Creator: Admiralty Compass Observatory
Date made: 1930
Credit: National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Measurements: Overall: 31 mm x 100 mm x 75 mm