Swivel gun
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A swivel gun is a small cannon, mounted on a swiveling stand or fork which allows a very wide arc of movement. Such weapons were used principally aboard sailing ships during the age of sail, serving as short-range anti-personnel ordnance. They were not ship-sinking weapons, due to their small caliber and short range, but could do considerable damage to anyone caught in their line of fire.
Swivel guns are among the smallest types of cannon, typically measuring less than 1 m (3 ft) in length and with a bore diameter of up to 3.5 cm (1ΒΌ in). They can fire a variety of ammunition but were generally used to fire grapeshot and similar types of small-diameter shot, though they could also fire small caliber round shot. As with other types of cannon, swivel guns are muzzleloaders. They were aimed through the use of a wooden handle, somewhat similar to a baseball bat, attached to the breech of the weapon.
In operational use, swivel guns were highly portable and could be moved around the deck of a ship quite easily (and certainly much more easily than other types of cannon). They could be mounted on the deck railings of a ship, which provided the gunner with a reasonably steady platform from which to fire. Their portability enabled them to be installed wherever they were most needed; whereas larger cannon were useless if they were on the wrong side of the ship, swivel guns could be carried across the deck to face the enemy.
The small size of swivel guns enabled them to be used by a wide variety of vessels, including those too small to accommodate larger cannons, and also permitted their use on land; they were commonly issued to forts in North America in the 18th century and Lewis and Clark took one with them on their famous expedition into the American interior in 1804. Swivel guns also had peaceful uses. They were used for signalling purposes and for firing salutes, and also found uses in whaling, where bow-mounted swivel guns were used to fire harpoons, and fowling, where swivel guns mounted on punts were used to shoot flocks of waterfowl.
Swivel guns should not be confused with pivot guns, which were far larger weapons mounted on a horizontal pivot.
