Airspeed Indicator, Sensitive, 700MPH, Army Type F-1, US Army Air Force, WWII PBY Catalina This electrical Tachometer was used

This electrical Tachometer was used in Cold War-era jet fighters and trainers of the United States Air Force

Using three HFDF measurements

tested in the US Navy's P-2 Neptune

The 384-page book is in good condition

The time is set by pulling out and rotating the knob at the front corner and rotating

Airspeed Indicator, Sensitive, 700MPH, Army Type F-1, US Army Air Force, WWII PBY Catalina This electrical Tachometer was usedThe Army Type F 1 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 1 was made by Bendix, part number 142 22B A A1, and has a