Deviation form, self propelled artillery

A deviation form,on which a deviation curve could be plotted, for use with self-propelled artillery.

Object Details

ID: ACO0457
Type: Deviation form, self propelled artillery
Display location: Not on display
Creator: Unknown
Date made: circa 1940
Credit: National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Measurements: Overall: 30 mm x 342 mm x 220 mm