Public domain
Fort Story coast defense. Projectile being loaded into an interrupted-screw type breech at Fort Story, Virginia. With a quarter turn, this breech gives the same sealing effect as twelve turns on a regualr screw
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Credit lineFort Story coast defense. Projectile being loaded into an interrupted-screw type breech at Fort Story, Virginia. With a quarter turn, this breech gives the same sealing effect as twelve turns on a reg. 1942-01-01. 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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