the inside and strengthened by an exterior tube made of wrought-iron bars spirally coiled and shrunk on; made at the West Point foundry, 1860.
15-in. Rodman gun, weighing 49,000 lbs., cast by the South Boston Iron Company, 1860.
Parrott gun first put to test of active warfare in the battle of Bull Run, July 21, 1861.
Gatling rapid-firing gun, from five to ten barrels around one common axis; tenbarrel Gatling discharges 1,200 shots a minute; range, 3,000 yds.; invented in 1861.
S. B. 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.