Public domain
Closing the cover of the mold. Entirely automatic, the "watch-case" mold is closed by pushing a button, which starts several operations. First the airbag is filled with live steam which circulates during the entire process; next an automatic timer sets itself for the proper length of time and temper
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineClosing the cover of the mold. Entirely automatic, the "watch-case" mold is closed by pushing a button, which starts several operations. First the airbag is filled with live steam which circulates dur. 1941-01-01. Palmer, Alfred T., United States. Office For Emergency Management. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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