Public domain
Three-inch A.A. cartridge cases. Cartridge cases for three-inch antiaircraft shells go through the first drawing operation. A brass cup formed from flat disc is fed to a huge press which draws it into a tubular shape with one rounded closed end. Washing and annealing precedes the first draw and will
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Credit lineThree-inch A.A. cartridge cases. Cartridge cases for three-inch antiaircraft shells go through the first drawing operation. A brass cup formed from flat disc is fed to a huge press which draws it into. 1942-01-01. 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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Three-inch A.A. cartridge cases. Cartridge cases for three-inch antiaircraft shells are produced by a series of operations that transform a flat brass disc into a case ready for loading with propelling charge and shell. Between each operation there is careful washing to remove all scale and adhesion
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