Protractor, Aircraft Navigation Plotter, US Naval Observatory PZL The glass is loose and

The glass is loose and appears to need a new gasket

This is an authentic WW2-vintage Landing Gear Pressure Indicator

The reset mechanism does not reset

and the scope is ~8 inches long

Protractor, Aircraft Navigation Plotter, US Naval Observatory PZL The glass is loose andThis is a WWII era Aircraft Navigational Protractor (aka Aircraft Plotter) Kit as used in navigator crewed aircraft of the US Army and Navy. This particular protractor has a tag from the US Naval Observatory stamped 1945. It would be fitted to the navigators map table to plot and revised the aircraft's course. The kit appears to be complete. Included with the protractor machine itself are two steel rulers in cardboard sheaths which attach to the