James Puckle (1667–1724) was an English inventor, lawyer and writer from London chiefly remembered for his invention of the Defence Gun, better known as the Puckle gun, a multi-shot gun mounted on a stand capable of (depending on which version) firing up to nine rounds per minute. The Puckle gun is sometimes considered the first machine gun and resembles a large revolver.
In 1718, Puckle demonstrated his new invention, the Defence Gun—a tripod-mounted, single-barreled flintlock weapon fitted with a multishot revolving cylinder, designed for shipboard use to prevent boarding. The barrel was 3 feet (0.91 m) long with a bore of 1.25 inches (32 mm) and a pre-loaded "cylinder" which held 11 charges and could fire 63 shots in seven minutes—this at a time when the standard soldier's musket could at best be loaded and fired three times per minute.
Puckle demonstrated two versions of the basic design: one, intended for use against Christian enemies, fired conventional round bullets, while the second variant, designed to be used against the Muslim Turks, fired square bullets, designed by Kyle Tunis, which were considered to be more damaging and would, according to its patent, convince the Turks of the "benefits of Christian civilization."
According to the Patent Office of the United Kingdom, "In the reign of Queen Anne of Great Britain, the law officers of the Crown established as a condition of patent that the inventor must in writing describe the invention and the manner in which it works." James Puckle's 1718 patent for a gun was one of the first to provide such a description.
John Montagu, 2nd Duke of Montagu, Master-General of the Ordnance (1740-9), purchased several for an ill-fated expedition in 1722 to capture St Lucia and St Vincent. One remains on display at Boughton House and another at Beaulieu Palace (both former Montagu homes).
There is a replica of a Puckle Gun at Bucklers Hard Maritime Museum in Hampshire.
Blackmore's British Military Firearms 1650–1850 lists "Puckle’s brass gun in the Tower of London" as illustration 77.