Altimeter, Type C, Tyco, 25,000FT, WWI to 1926 Air Service USArmy F9F Panther and UH-1 Bell Huey

and UH-1 Bell Huey

Side one is used to correct the course of flight due to wind direction: by setting the black arrow to the desired course and rotating the white inner dial to the wind direction in black

Its former owner was an RCAF F-86 Pilot

25 inches = 10 miles

The system included a sighting head connected to a mechanical (pneumatic) computer

Altimeter, Type C, Tyco, 25,000FT, WWI to 1926 Air Service USArmy F9F Panther and UH-1 Bell HueyHere is an Altimeter used in military aircraft of the Air Service, US Army, which existed with that name from 1918 1926 until it was renamed Air Corps US Army. Crudely measured altitude from 0 25,000 ft, which was pretty high for aircraft of that era and requiring supplemental oxygen for the crew to exceed ~12,500 ft based upon modern standards. The knob would rotate the face of the dial while the pointer remains fixed to set the present field