Public domain
At several stages during their manufacture, the engines are subjected to exacting tests. Here a skilled machinist is inspecting the main and connecting rod bearings of an engine that has been run on the test block, then dismantled to determine the amount of stress and wear it has suffered. Packard m
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Credit lineAt several stages during their manufacture, the engines are subjected to exacting tests. Here a skilled machinist is inspecting the main and connecting rod bearings of an engine that has been run on t. 1941-01-01. United States. Office For Emergency Management, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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