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December 1942. "Checking electrical wiring assemblies for B-17F (Flying Fortress) bombers at the Boeing plant in Seattle." Photo by Andreas Feininger for the Office of War Information. View full size.
I had a great Aunt that worked at the Delco-Remy Division of General Motors in Anderson, IN where she assembled magnetos for bombers. She would talk about how serious they took their work because they knew someones' son, husband or brother life depended on them making it right. Many of the girls she worked with had nightmares from the stress they put themselves under to do their job perfectly.
... can check the integrity of my circuits any time!
The harnesses are made on a large board with pegs in it, running wire color A from point B to C around the pegs in the right path, and then roped securely.
Presumably all the wire ends are in the right place when you get it on the airplane.
It wasn't until the late 70s that robots began to do the wire-running job, still around the same pegs.
The placement of the connectors matches up with the right side of the panel, where the engine instruments are located.
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