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Chrysler tank arsenal. Headed for the oven, this rack of herringbone gears has been completed and is now awaiting the hear treatment which will harden the gears for use in the M-3 tank. Dozens of different types of gear arrangements are used in these twenty-eight ton monsters

Chrysler tank arsenal. Headed for the oven, this rack of herringbone g...

Public domain photograph - working class people, the 1930s United States, work, labor, worker, free to use, no copyright restrictions image - Picryl description

Lumber manufacture. Boise Payette Lumber Company, Boise, Idaho. On this hear rig (leg carriage) the logs are sliced down to Ponderosa pine boards, many of which are being used for defense construction

Lumber manufacture. Boise Payette Lumber Company, Boise, Idaho. On thi...

Picryl description: Public domain image of a mine, mining, free to use, no copyright restrictions.