Artillery Firing Calculator, USSR, 1944 Northrop California) dated Nov 19

California) dated Nov 19

The B-20 Compass design is unique in that it contains a magnetic horizontal float suspended in damping fluid that engages the directional pointer on a vertical compass card to display direction

or release it for use during flight

With 11 sections plus appendix and index

Artillery Firing Calculator, USSR, 1944 Northrop California) dated Nov 19True, this is not aviation in nature, but it is an exceptional artifact from WWII. This is an original Soviet Army Artillery Firing Calculator, used in determining proper elevation and deflection (direction) when operating field artillery weapons. It was carried in the map document case worn by a Soviet artillery officer. The calculator contains diagrams and a graph, with rotating wheels and tabs, and made of material which permits writing in