Public domain
Fort Story coast defense. A tough job for soldiers: shoving the breech block of the giant howitzer into place. The screw threads help the block to withstand millions of foot pounds of pressure caused by the exploding charge
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineFort Story coast defense. A tough job for soldiers: shoving the breech block of the giant howitzer into place. The screw threads help the block to withstand millions of foot pounds of pressure caused . 1942. 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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