TBF-1 Avenger Torpedo Bomber Cruising Calculator Mark 1-A, Ser # 0300-43 P5M Marlin This altimeter is similar in

This altimeter is similar in appearance to that shown in the F4U Corsair Flight Manual dated 1944

and original wooden case

Here is Radar Pressure Indicator use in radar-equipped aircraft during late WWII and post WWII

the Section developed numerous innovative training devices

The first flight of the AC-130A wasn't until 1966

TBF-1 Avenger Torpedo Bomber Cruising Calculator Mark 1-A, Ser # 0300-43 P5M Marlin This altimeter is similar 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