Control Unit C-4, of ARN-7 Automatic Radio Compass, B-17, B-24, B-29 Nick Fighter The screw (H) (two) serves

The screw (H) (two) serves to fasten the instrument to the mounting plate

Included is a Center of Gravity Computer dated 1942

Few have survived in this condition

but not the Royal Air Force since it didn't come into existence until 1918)

using an A-6 cartridge containing 50 feet of 16mm film and a 35mm lens

Control Unit C-4, of ARN-7 Automatic Radio Compass, B-17, B-24, B-29 Nick Fighter The screw (H) (two) servesHere is a WWII era Control Unit for the ARN 7 Automatic Radio Compass system used for direction finding and homing. The receiver function tunes from 100 1750 kHz across 4 bands, which were selected by rotating the center knob below the frequency band window. The center knob rotates a flexible shaft connected to a rotatable loop antenna. The ARN 7 system (see diagram), were one of several generations of radio navigational systems installed in an