Aircraft Electrical Instruments Preliminary Course Instructions 1942 A-1 Skyraider Six mounted in in various

Six mounted in in various places

Lockheed C-130 Hercules and C-121 Constellation transports used this system

See photo of cockpit instrument panel illustrating this instrument

Here is a WWII-era Second Air Force handbook of Standard Procedures for the Flight Engineer

Aircraft Electrical Instruments Preliminary Course Instructions 1942 A-1 Skyraider Six mounted in in variousHere is a course manual with an interesting past. This Aircraft Electrical Instruments Preliminary Course trained civilians for employment at air depots to supplement the war effort during WWII. The US Office of Education in cooperation with the US Board for Vocational Education prepared this course for the Air Service Command, US Army Air Corps, in 1942. The manual covers the inspection, maintenance, overhaul, and calibration of electrical aircraft