Free Air Temperature Indicator, Direct Reading, Type C-13A WWII AT-6 see illustration from its Erection

see illustration from its Erection and Maintenance manual dated 1945

It is clearly experienced but in good condition given its age

was made by RC Allen

The markings are clear and the glass and case are intact

from 0-350 deg C via dual thermocouple

Free Air Temperature Indicator, Direct Reading, Type C-13A WWII AT-6 see illustration from its ErectionThis is an authentic vintage Direct Reading Free Air Temperature Indicator Type C 13A, as used in Bombers Boeing B 17 Flying Fortress and Consolidated B 24 Liberator, plus Transport Douglas C 47 Skytrain and others. The instrument indicated to the pilot the aircraft's external air temperature from 60dC to +50dC in aircraft of the Air Force US Army, and would have its stem installed from the cockpit or the bombardier's compartment thru the skin or the