Public domain
A Keller machine cutting a die shape from a plaster model. The model is at the top. A "feeler" tool runs along the surface of the model and controls the cutting tool at the bottom in such a manner that the contours of the model are duplicated with an extremely high degree of precision in the cast-ir
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineA Keller machine cutting a die shape from a plaster model. The model is at the top. A "feeler" tool runs along the surface of the model and controls the cutting tool at the bottom in such a manner tha. 1941-01-01. United States. Office Of War Information, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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