Compass, Aperiodic, US Military Aircraft, Pioneer 1811-1-D C-45 but seems to run

but seems to run

The device is clearly out of calibration

5 inch deep

but could probably be recalibrated with the compensator screws

Measures approximately 4 inches square and 2 inches deep

Compass, Aperiodic, US Military Aircraft, Pioneer 1811-1-D C-45 but seems to runThis appears to be a post WWII Direct Reading Aperiodic Compass used at the navigators station in US military aircraft. Made by Bendix, part number 1811 1 D. It appears to have never been put into service judging from its superb condition. An aperiodic compass, after being deflected, returns by one direct movement to its proper reading, without oscillation. It is similar to a WWII era D 12 compass, which was typically mounted on the navigator's desk.