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To save time in checking threads on a twenty-millimeter shell booster, a plant superintendent built this machine. It makes possible a speedy checking of thread accuracy in contrast to the old hand method. The inventor made the machine out of a fan base and a couple pieces of machine steel in a matte
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To save time in checking threads on a twenty-millimeter shell booster, a plant superintendent built this machine. It makes possible a speedy checking of thread accuracy in contrast to the old hand method. The inventor made the machine out of a fan base and a couple pieces of machine steel in a matte

United States. Office For Emergency Management · 1940-01-01 · photo, print, drawing

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

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nitrate negativesunited states
Credit lineTo save time in checking threads on a twenty-millimeter shell booster, a plant superintendent built this machine. It makes possible a speedy checking of thread accuracy in contrast to the old hand met. 1940-01-01. United States. Office For Emergency Management. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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