Artillery Firing Calculator, USSR, 1944 Northrop This is a 1950's-era Attitude

This is a 1950's-era Attitude Gyro Horizon Indicator as used in the US Navy/Marine Corps Fighter Jet Grumman F9F-5 Cougar and the HUP-1

The wheel at the left of the digit display counter is used to set the total rounds loaded into the aircraft

indicates 1942 year of manufacture for an order from the Air Force US Army

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

Artillery Firing Calculator, USSR, 1944 Northrop This is a 1950's-era AttitudeTrue, 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