TBF-1 Avenger Torpedo Bomber Cruising Calculator Mark 1-A, Ser # 5031-43 B-47 shifts the index line in

shifts the index line in the small round window at ~19

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

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

The data plate is absent from this example

TBF-1 Avenger Torpedo Bomber Cruising Calculator Mark 1-A, Ser # 5031-43 B-47 shifts the index line inThis 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