Page:Popular Science Monthly Volume 91.djvu/515

 Is the Order Given to the Coast Artilleryman

���A big gun at the moment of firing. It has been elevated into position before firing, and immediately afterward it falls back out of sight on its supporting members. The two-ton shell it has hurled off into space can penetrate the thickest armor of any battleship that may dare to poke its nose within a dozen miles of our coast

���"Tactics change every ten years," said Napoleon. Before the war our coast artillery was practising at ten thousand yards ; now the range has developed into twenty thousand yards and more. The energy neces- sary to fire a shot from the gun in the picture con- tinued from the preceding page would project your two-ton automobile twenty-seven miles in less than twice as many seconds

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