USS Maine - Hotchkiss Rapid-Fire Gun
(Photograph by E. H. Hart)

"The One-pounder Hotchkiss rapid-fire gun is made of all steel. Weight, 120 pounds; total length, 62 inches; greatest diameter of gun body, 4.72 inches; weight of cartridge complete, 1.5 pounds; weight of shell 1 pound; weight of charge, 2.8 ounces; initial velocity, 1,319 feet; range at 40 degrees elevation, 2.245 miles. It is composed of a central tube, jacket and locking ring. The twist of rifling is uniform; angle of rifling, 6 degrees; and the number of grooves is twelve." - Johnston

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