TBF-1 Avenger Torpedo Bomber Cruising Calculator Mark 1-A, Ser # 5031-43 B-47 DC 0-400 Microamps Westinghouse style

DC 0-400 Microamps Westinghouse style CH-10533-N3-1 approx 3

who was a maker/distributor of drafting and surveying instruments and supplies

This indicator

used to calibrate the compass

TBF-1 Avenger Torpedo Bomber Cruising Calculator Mark 1-A, Ser # 5031-43 B-47 DC 0-400 Microamps Westinghouse styleThis is an authentic original WWII era Cruising Computer Mark 1 A designed specifically for the US Navy's Grumman Torpedo Bomber TBF 1. The purpose of the calculator was to determine the range, in nautical miles, of the aircraft under various conditions of aircraft weight, head tail winds, fuel quantity on board, true air speed, altitude, and throttle and supercharger blower settings. The calculator is essentially a custom 3 panel slide rule