"7-inch Armstrong Breech-loader." — Encyclopedia Britannica, 1893
"9-poounder Field Gun Carriage (elevation )." — Encyclopedia Britannica, 1893
"9-pounder Field Gun Carriage (plan)." — Encyclopedia Britannica, 1893
"A Gatling Gun ready for firing." — Encyclopedia Britannica, 1893
"Lock of a Gatling Gun." — Encyclopedia Britannica, 1893
"The Gatling gun is a machine gun, invented by Richard J. Gatling. The gun consists of a series of barrels…
"9-pounder Limber (elevation)." — Encyclopedia Britannica, 1893
"9-pounder Limber (plan)." — Encyclopedia Britannica, 1893
"Nordenfelt Machine Gun. 1-10, parts of frame; 11, breech plug; 12, striker; 13, extractor; 14, cartridge…
"Nordenfelt Machine Gun." — Encyclopedia Britannica, 1893