Caliber

Definition and stakes

Ernest F. Henderson,  Germany's Fighting Machine

“ The caliber is seven and nine-tenths millimeters, a fact which may not at first seem to the American reader of great importance, but which becomes more interesting when it is realized that this is the smallest caliber which will inflict sufficient injury on an enemy to make its use profitable. ”
Source: Gutenberg

The Wonder Book of Knowledge

“ It may be noted that the caliber is the diameter of the bore of a gun. The statement that a gun has a length of 45 calibers, for example, implies that the gun is forty-five times the bore’s diameter. Thus a 12-inch gun of 45 calibers is 45 feet long. ”
Source: Gutenberg

Thomas Wilhelm,  A Military Dictionary and Gazetteer

“ For both land and sea service are used a 24-centimetre weighing 13.8 tons, caliber 9.499 inches, a 19-centimetre weighing 7.9 tons, caliber 7.638 inches, a 16-centimetre weighing 98.42 cwt., caliber 6.484 inches, a 14-centimetre weighing 52.26 cwt., caliber 5.456 inches. The guns used for sea service only, or for both land and sea service, are all made of cast iron, tubed with steel nearly to the trunnions, and strengthened near the breech by steel rings heated and shrunk on. The fortress guns, most of the siege, and all the field-guns are made of bronze. ”
Source: Gutenberg

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