Battery Gun" By Richard Jordan Gatling, 1865

"Officially adopted by the U.S. Army on August 21, 1866, the Gatling gun was the first successful rapid-fire repeating gun. Invented by Dr. Richard Jordan Gatling, a physician, the first model of his "Battery Gun" was patented on May 9, 1865, and had six barrels revolving around a central axis. It proved superior to other rapid-fire guns of the time and, for more than 40 years, the Gatling gun was used by almost every world power.."
Gatling Gun 

"Battery Gun" By Richard Jordan Gatling, 1865

"Offically adopted by the U.S. Army on August 21, 1866, the Gatling gun was the first successful rapid-fire repeating gun. Invented by Dr. Richard Jordan Gatling, a physician, the first model of his "Battery Gun" was patented on May 9, 1865, and had six barrels revolving around a central axis. It proved superior to other rapid-fire guns of the time and, for more than 40 years, the Gatling gun was used by almost every world power.."
Battery Gun

Battery Gun" By Richard Jordan Gatling, 1865

"Officially adopted by the U.S. Army on August 21, 1866, the Gatling gun was the first successful rapid-fire repeating gun. Invented by Dr. Richard Jordan Gatling, a physician, the first model of his "Battery Gun" was patented on May 9, 1865, and had six barrels revolving around a central axis. It proved superior to other rapid-fire guns of the time and, for more than 40 years, the Gatling gun was used by almost every world power..."
Gatling Gun