Pelorus, Aircraft, US Navy Mk I 18-P-21690 AT-6 All of the knobs turn

All of the knobs turn and toggles flip

The third section describes various gun turrets and their operation

The knobs turn freely

Measures 3

the upper center indicator displays a flap symbol along the scale showing the amount of flap deployed

Pelorus, Aircraft, US Navy Mk I 18-P-21690 AT-6 All of the knobs turnThis is a WWII era Aircraft Pelorus Mk I used by air navigators in the US Navy. The Pelorus was used for taking bearings on objects of interest, be they celestial or terrain. The bearing sight (the cross bar) can be inclined or declined on its center axis, and rotated to the desired bearing which can be read on the base scale. Drift angle can also be determined. Measures approximately 5 inches diameter and 4 inches tall.