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. Another type of firearm referred to as a swivel gun was an early flintlock combination gun
Three examples of 18th-century swivel guns
Breech-loading swivel gun with mug-shaped chamber, and wedge to hold it in place.
A Japanese breech-loading swivel gun of the time of the 16th century, obtained by Ōtomo Sōrin. This gun is thought to have been cast in Goa, Portuguese India. Caliber: 95 mm (3.7 in), length: 2.88 m (9.4 ft).
A Ming bronze cannon with open breech.
Cetbang
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Cetbang were cannons produced and used by the Majapahit Empire and other kingdoms in the Indonesian archipelago. There are 2 main types of cetbang: the eastern-style cetbang which looks like a Chinese
A galley from Banten, four cetbang can be seen.
Majapahit cetbang cannon from the Metropolitan Museum of Art, New York, from ca. 1470–1478. The Surya Majapahit emblem can be seen. The bulge at the back of the breech is actually a hole where the tiller or wooden butt is inserted.
A Madurese galley, showing four cetbang.
A cetbang found on Selayar island