Vector Plotting Machine AN-5748 in Original Packaging Bf-109 From our research

From our research

covering Radio Range and Radio Compass

The case is 8 inches tall

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)

Here is a nice specimen of a WWII-era electrical Switchable Tachometer

Vector Plotting Machine AN-5748 in Original Packaging Bf-109 From our researchHere 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,