Bombardiers' Information File US Army Air Force May 1945 Piasecki So it is possible that

So it is possible that there is some connection there

This is a centrifugal tachometer: as the rotation of the engine shaft rotates a cable attached to the case

"Kelly" Johnson

To permit dropping the radio set in this manner

but utilizes an electro-magnetic compensation system

Bombardiers' Information File US Army Air Force May 1945 Piasecki So it is possible thatHere is a WWII era Bombardiers' Information File published by the US Army Air Force May 1945. It contains the essential information on the duties and responsibilities of the bombardier. It is in exceptional condition given its age. Measures 8. 5 x 11 inches, and ~0. 5 inches thick.