Compass, Aperiodic, US Military Aircraft, Pioneer 1811-1-D C-45 but could probably be recalibrated

but could probably be recalibrated with the compensator screws

Heading Index

The device is clearly out of calibration

indicates the manufacturing year 1944

Compass, Aperiodic, US Military Aircraft, Pioneer 1811-1-D C-45 but could probably be recalibratedThis 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.