Free Air Temperature Indicator, Direct Reading, Type C-13A WWII AT-6 the bellow causes a pen

the bellow causes a pen scribe to rise along the strip chart

see illustration from its Erection and Maintenance manual dated 1945

The E-13 Tachometer was used in various US fighter aircraft

was made by RC Allen

This is a vintage Wing Flap Position Indicator made by General Electric Type DJ-17 Model 8DJ17ABE

Free Air Temperature Indicator, Direct Reading, Type C-13A WWII AT-6 the bellow causes a penThis 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