This is an attractive and highly desirable example of a rarely seen Hotchkiss 37mm "1-Pounder" 5-barrel revolving cannon mounted on an iron carriage. The Hotchkiss revolving cannon is similar in operation from an outside perspective to the more famous Gatling gun, though scaled up and with an entirely different internal operating mechanism; the 37mm bore dwarfs the .45 and .30 caliber Gatlings. Using a five-barrel cluster, the Hotchkiss cannon is fed with 9-round gravity driven magazines, which would be replaced by a gunner's assistant while the gunner operates the elevation and traverse knobs along with the main crank handle for firing, with capability of around 68 rounds per minute with a skilled operator and accuracy up to around 2,000 yards (over a mile). These were invented in 1872 by Benjamin B. Hotchkiss. Versions were designed for field, fortress and naval use. They were used by several countries throughout the world, including the U.S., France, and Russia. A 37 mm Hotchkiss field gun is known to have been used by the U.S. Army during the Indian Wars including during the Ute Uprising in Colorado in 1879. Others were used during the Spanish-American War by both sides. Hotchkiss naval revolving cannons continued to be used even into World War I primarily as defensive weapons used by larger vessels against torpedo boats. Marked with a circular "HOTCHKISS * PATENT/* PARIS 1875 *" around "No 17" on the rear. "17" marked on the end of the crank. Iron cone front sight with a detachable elevation and windage adjustable notch rear sight. The crank handle is iron with a swiveling brass grip, and mounts with a quick release latch. The iron carriage has a large shield, a storage compartment in the rear that has inserts to hold the included rear sight, oiler, crank handle and firing pin, and a fold out brass tipped transport rod is located on the rear. With this rod out, a single man can aim the cannon with some effort. "DIREITA" (right) and "ESQUIERDA" (left) marked in Spanish on the brass windage knob on the carriage. Included with the lot is a modern wood cartridge block spacer for use with cycling unloaded shell casings, and a metal box containing some modern empty shell casings.