Aircraft Instrument Course 1939: The Air Corps Technical School M-41-4 Sally Bomber or film spools

or film spools

The manual is in very good condition despite some discoloration on the cover and some minor deterioration on the upper corner of the last 4 pages

The floating ball indicator no longer contains damping fluid

which appeared on the engineers panels of the Boeing B-50 Bomber and KC-97 Stratotanker

Aircraft Instrument Course 1939: The Air Corps Technical School M-41-4 Sally Bomber or film spoolsDated 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