Public domain
Production. Airplane propellers. Three-way spider forgings for the hydraulic mechanism that adjust propeller blade pitch await precision machining at a Hartford, Connecticut, plant. This plant produces great numbers of variable pitch propellers with two-, three- and four-blade propellers
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Credit lineProduction. Airplane propellers. Three-way spider forgings for the hydraulic mechanism that adjust propeller blade pitch await precision machining at a Hartford, Connecticut, plant. This plant produce. 1942-01-01. United States. Office Of War Information, Feininger, Andreas. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.