Altimeter, Tycos Type C, 25,000FT, WWI Aviation Section Signal Corps US Army C-43 all pages are intact

all pages are intact

Its use was carried over to aircraft used in the Korean War

and also used on the Focke-Wulf Fw190 Fighter

which cross references to those used in RAF aircraft

See images from their flight manuals

Altimeter, Tycos Type C, 25,000FT, WWI Aviation Section Signal Corps US Army C-43 all pages are intactHere is a Type C Altimeter used in early military aircraft of the US Army Air Service during WWI. It is labeled as having been manufactured for the Aviation Section Signal Corps US Army, which was active from 1914 to 1918. 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 rotates the face of the dial while