Altimeter, Type C, Tyco, 25,000FT, WWI to 1926 Air Service USArmy Peggy Bomber made by Ludolph in August

made by Ludolph in August 1940

as appeared on the flight engineers panel of aircraft of the US Navy such as the patrol bomber / seaplane PBM-5 Mariner (see illustration showing the location on the panel from the PBM-5 flight manual dated 1944)

this acronym may be from an office of the Joint Intelligence Collecting Agency office in North Africa

and the left knob sets the course heading

Altimeter, Type C, Tyco, 25,000FT, WWI to 1926 Air Service USArmy Peggy Bomber made by Ludolph in AugustHere 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