Aircraft Instrument Course 1939: The Air Corps Technical School M-41-4 Sally Bomber ID-14/ARN-1 was a component of

ID-14/ARN-1 was a component of Radio Set AN/APN-1

It has a detector unit

Requires the correct electrical input to operate

"AC US ARMY" is embossed on the face of the instrument (black on black)

or film spools

Aircraft Instrument Course 1939: The Air Corps Technical School M-41-4 Sally Bomber ID-14/ARN-1 was a component ofDated September 1, 1939, this pre WWII instructional manual is for the Aircraft Instruments course of The Department of Mechanics in The Air Corps Technical School, M 41 1. Consisting of 258 pages and dozens of illustrations and diagrams, this compendium describes the purposes, uses, descriptions, operations, installation, service, inspection, and maintenance of more than 30 instrument types. The manual covers instruments that were eventually used in