Compass, Magnetic Direct Reading, US Navy AN5732-1 JU-52 but whose purpose is unknown

but whose purpose is unknown

but the rear windscreen is not identical to this one

historical document is a collection of Technical Notes assembled by the instructional staff of the School of Military Aeronautics at the University of Illinois in June 1917 for its new curriculum in preparation for America's entry into World War I

It also has a service label dated June 8

Compass, Magnetic Direct Reading, US Navy AN5732-1 JU-52 but whose purpose is unknownHere is a fine example of the US Navy's Aircraft Direct Reading Magnetic Compass AN5732 1 (known earlier as Mark VIII), as used in the SBD Dauntless Dive Bomber and the TBM Avenger Torpedo Bomber. This compass was installed above the pilot's forehead, see image of the SBD's cockpit showing the location of this compass. The compass was illuminated electrically via bulb (not included) mounted in a small compartment over the compass itself. Inside the