Vector Plotting Machine AN-5748 in Original Packaging Bf-109 it covers all essential aspects

it covers all essential aspects of the aircraft for the pilots reference

covering Radio Range and Radio Compass

It was made for an order by the Air Corps US Army (as evidenced by the embossed AC US ARMY) in 1937 (further evidenced by the serial number prefix AC-37)

and the unit is 14 inches high

Vector Plotting Machine AN-5748 in Original Packaging Bf-109 it covers all essential aspectsHere is an authentic WWII era navigational plotter used by aircraft navigators to plan, plot, and track their course along a chart. The plotter would be affixed to a navigator's map table and laid upon the map of the flight plan, typically in a large aircraft. It is essentially a flight computer as it provides the navigator with the integral calculators for heading, track, true air speed, and ground speed. This example is in its original packaging,