Altimeter, Sensitive, Type C-12, 50,000 ft, US Army Air Force WWII Royal Navy Radio beacons on the airfield

Radio beacons on the airfield transmitted signals

It is ~ 3 inches thick in a USAF Publications hard binder and the contents are in very good condition given its age

made by Kelvin Bottomley & Baird aka KBB Instruments

PB4 Privateer

Above that limit

Altimeter, Sensitive, Type C-12, 50,000 ft, US Army Air Force WWII Royal Navy Radio beacons on the airfieldHere 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. The C 12 Sensitive Altimeter displayed altitude using 3 pointers. The