WW2 1941 Dated Air Ministry Parallel Rule

A WW2 RAF Air MInistry parallel ruler. Marked 'Captain Field's Improved with the Air Ministry stamp and dated 1941. As used by RAF navigators and bomber aircrew. Made by Aston & Mander of London, who supplied navigational and other instruments to the British armed forces in both world wars. Made of boxwood with brass fittings this ruler is in great condition.

Code: 51962