Bombardiers' Information File US Army Air Force May 1945 Piasecki This is a centrifugal tachometer:

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

part number EA-101-1

Made of either stiff plastic or Bakelite

The Army Type F-2 Airspeed Indicator was used across a number of US Army Air Corps and Air Force aircraft during WWII

"Kelly" Johnson

Bombardiers' Information File US Army Air Force May 1945 Piasecki This is a centrifugal tachometer:Here 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.