Protractor, Aircraft Navigation Plotter, US Naval Observatory PZL Brake Mean Effective Pressure (BMEP)

Brake Mean Effective Pressure (BMEP)

totaling 1000 gallons in all

Weston (pointer stuck at 6K)

In the servoed mode

The glass is loose and appears to need a new gasket

Protractor, Aircraft Navigation Plotter, US Naval Observatory PZL Brake Mean Effective Pressure (BMEP)This 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