The front page of the "Scientific American" on March 2, 1872, had a story of a new model of the Gatling gun produced by Colt's Armory. It was called the battery gun and featured a Broadwell drum with 400 cartridges. Here it is shown in a proposed mount for camels (elephants were also considered). No mentions of test results of this configuration, but apparently hopes of Middle Eastern and Asian sales ( ... nothing new under the sun ...).