Gyro Transmitter, AN5751-1, Flux Gate Compass System F8F This type of compass is

This type of compass is mounted horizontally

according to archival documents

This Radio Compass Indicator is labeled for use in the WWII-era Air Corps US Army's C-3 Link Trainer

25 inches diameter and ~10 inches deep

with two small lamps intact

Gyro Transmitter, AN5751-1, Flux Gate Compass System F8F This type of compass isThe Gyro Transmitter AN5751 1 was an integral component of the WWII era Bendix Gyro Flux Gate Compass System used in aircraft such as the B 17, B 24, and B 29. The 7 component Flux Gate Compass system was designed to provide accurate navigational guidance using the earth's magnetic forces by minimizing interference from the systems of the aircraft, such as its turrets, guns, and engines. A flux gate gyro transmitter typically located within the wing