Control Unit C-4, of ARN-7 Automatic Radio Compass, B-17, B-24, B-29 Mosquito The A-9A regulator was a

The A-9A regulator was a low pressure continuous flow regulator (vs the on-demand

Here is a fine example of the US Navy's Aircraft Direct Reading Magnetic Compass Mark VIII

(The prism has a small chip in its lower left corner)

black dial stopwatch under military specification no

The type of aircraft which used this tachometer has not yet been identified by us

Control Unit C-4, of ARN-7 Automatic Radio Compass, B-17, B-24, B-29 Mosquito The A-9A regulator was aHere 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