Airspeed Indicator, Sensitive, 700MPH, Army Type F-1, US Army Air Force, WWII PBY Catalina The 384-page book is in

The 384-page book is in good condition

Using three HFDF measurements

This example is exceptional given that the glass

qualifies as a compass because of the need to rotate the compass heading to the ships heading before observing the relative heading of a sighting

Airspeed Indicator, Sensitive, 700MPH, Army Type F-1, US Army Air Force, WWII PBY Catalina The 384-page book is inThe 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