Airspeed Indicator, Sensitive, 700 Knots, Army Type F-1A, US Army Air Force, WWII F7F Tigercat Oxygen Pressure

Oxygen Pressure

and is not visible in the photo

We have not found documentation of its use

Measures ~ 6 x 6 x 7 inches deep

This particular protractor has a tag from the US Naval Observatory stamped 1945

Airspeed Indicator, Sensitive, 700 Knots, Army Type F-1A, US Army Air Force, WWII F7F Tigercat Oxygen PressureThe Army Type F 1A Airspeed Indicator was used across a number of US Army Air Corps and Air Force aircraft during WWII, including heavy bombers B 17, B 24, B 29, medium bombers B 25 and B 26, as well as light bomber A 20, according to the Accessories Interchangeability Chart dated Feb 1945. It was also used in versions of US Army Air Force WWII fighters P 38, P 39, P 40, P 47, and P 51. This F 1A was made by Kollsman, part number 739BU 03, and has a