Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Corps, WWII B-52 the "Polyplane Compensator" to correct

the "Polyplane Compensator" to correct for compass deviation

The ammeter could be illuminated from the back

The Type P8 Navigational Compass

The equipment is being redesigned for production by Ryan Aeronautical Company with the expectation that it will weigh about 175 lbs

Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Corps, WWII B-52 the "Polyplane Compensator" to correctThe Army Type D 7 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 D 7 was made by Kollsman, part number 586K 028, and has a