Public domain
Barrel of a .30 caliber rifle photographed. For the first time, in a motion picture has been made of the entire interior of a .30 caliber rifle barrel. This photograph shows I.C. Gardner, (left) and F.A. Case, of the U.S. Bureau of Standards in Washington, who designed the apparatus. This novel came
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
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Credit lineBarrel of a .30 caliber rifle photographed. For the first time, in a motion picture has been made of the entire interior of a .30 caliber rifle barrel. This photograph shows I.C. Gardner, (left) and F. 1923. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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