Altimeter, Sensitive, Type C-12, 50,000 ft, US Army Air Force WWII DC-3 a radio freguency carrier which

a radio freguency carrier which is frequency modulated at a rate of 120 cycles per second between the approximate limits of 420 and 460 mc on the low range (0-400 feet) and 443 to 447 mc on the high range (400-4000 feet)

but is frozen in position in this specimen and may be able to be repaired

leaving witness marks on the inner glass

We have not tested it

or Elevator/Nose Position Indicator

Altimeter, Sensitive, Type C-12, 50,000 ft, US Army Air Force WWII DC-3 a radio freguency carrier whichHere is an early WWII era Sensitive Altimeter, Air Corps US Army Type C 12, made by Kollsman. The C 12 Altimeter was used across all aircraft of the Air Corps US Army, including heavy bombers B 17 and B 24, medium bombers, B 25 and B 26, Fighters P 38, P 39, P 40, P 47, and P 51, and transports C 46 and C 47, according to the Maintenance Interchangeability Chart dated Dec 1943. It has a serial number prefix AF 43, evidence of a manufacturing year