Protractor, Aircraft Navigation Plotter, US Naval Observatory PZL (see description of this system

(see description of this system and its components in the photo gallery)

This is an authentic WW2-vintage Landing Gear Pressure Indicator

The indicator measures the temperature of the cylinder head via thermocouple from a single engine

The indicator has two pointers

The reset mechanism does not reset

Protractor, Aircraft Navigation Plotter, US Naval Observatory PZL (see description of this systemThis 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