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A Keller machine cutting a die shape from a plaster model. The plaster 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 on the
Public domain

A Keller machine cutting a die shape from a plaster model. The plaster 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 on the

United States. Office For Emergency Management, Palmer, Alfred T. · 1941-01-01 · photo, print, drawing

From the collection of Library of Congress. Free to download, adapt and use — no permission needed.

Subjects
detroitunited stateswayne countysafety film negativesmichigan
Credit lineA Keller machine cutting a die shape from a plaster model. The plaster 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 ma. 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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