Vertical Speed Indicator 6,000 Ft/min F6F Hellcat and UH-1 Bell Huey

and UH-1 Bell Huey

Yokosuka D4Y Dive Bomber Type 1 Suisei aka "Judy"

The Radio Altimeter was used in a number of aircraft of the US Navy where close monitoring of height over terrain was critical

The Fl number is illegible

is presumed to be WW II era from an aircraft of the Armée de l'Air

Vertical Speed Indicator 6,000 Ft/min F6F Hellcat and UH-1 Bell HueyHere is an early WWII era Vertical Speed (Rate of Climb) Indicator made by Kollsman, part number 716K 01 7007, used to indicate the vertical airspeed of the aircraft in a climb or descent. This model indicated vertical airspeed from 0 6,000 feet per minute. It has an adjustment screw at the lower left corner to calibrate the pointer to zero at level flight. The subsequent Kollsman model 716K 02, which was made to the US Army Air Force Type C 2 spec,