Plotting Machine AN-5748 in Wooden Case Constellation not gallons

not gallons

A friction control knob is in the center of the body

According to the F-94 Starfire Flight Manual:

and its serial number prefix is AF-44

This is an original WWII-era training booklet published by the US Navy's Aviation Training Division in 1942

Plotting Machine AN-5748 in Wooden Case Constellation not gallonsHere 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. The kit includes the plotter (a protractor with base), a straight edge, a mounting clamp, an extra tension band, and an envelope of fasteners. This example is in its original wooden case,