. Dean, of South Boston Iron Company, patents a process of rough boring bronze guns and forcibly expanding the bore to its finished size by means of mandrels, 1869.
Pneumatic dynamite torpedo-gun built and mounted at Fort Lafayette (founded on invention of D. M. Mefford, of Ohio), 1885.
Congress makes an appropriation for the establishment of a plant for gunmaking at the Watervliet arsenal, West Troy, 1889.
Manufacture of heavy ordnance begun at the Washington navy-yard, 1890.
Hotchkiss gun, English make, five barrels, revolving around a common axis, placed upon block weighing about 386 tons, fires thirty rounds a minute; adopted by the United States in 1891.
Automatic rapid-firing gun, invented by John and Matthew Browning, of Ogden, Utah; firing 400 shots in one minute and forty-nine seconds; adopted by the United States in 1896.
Zalinski's dynamite gun, calibre 15 ins.; throws 500 lbs. of explosive gelatine 2,100 yds.; also discharges smaller shells.
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