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Aluminum casting. The heads of these heat-treated pistons must be spotted prior to Brinnell hardness testing. Young women…
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Aluminum casting. The heads of these heat-treated pistons must be spotted prior to Brinnell hardness testing. Young women are employed for this job by a large Midwest aluminum foundry now converted to war production. Aluminum Industries Inc., Cincinnati, Ohio. Sourced from the Library of Congress.

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Aluminum casting. The heads of these heat-treated pistons must be spotted prior to Brinnell hardness testing. Young women are employed for this job by a large Midwest aluminum foundry now converted to war production. Aluminum Industries Inc., Cincinnati, Ohio. Sourced from the Library of Congress.

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