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The demi-cannon was a medium-sized cannon, similar to but slightly larger than a culverin and smaller than a regular cannon, developed in the early 17th century. A full cannon fired a 42-pound shot, but these were discontinued in the 18th century as they were seen as too unwieldy. The lower tiers of 18th century English Man-of-war were usually equipped with demi-cannons.
Ships featuring demi-cannons included Sovereign of the Seas, Resolution and James, which fought in the Anglo-Dutch Wars. Demi-cannons were also used on HMS Stirling Castle, the wreck of which was discovered in the Goodwin Sands. Several examples of this weapon were recovered from the site.
The barrels of demi-cannon were typically long, had a caliber of and could weigh up to . It required of black powder to fire a round shot. The demi-cannon had an effective range of .
These 32-pounders were used during the 18th century on first-rate ships of the line which carried up to 100 guns. Though powerful, the naval demi-cannons were inaccurate, except at close range, which allowed warships to cause as much damage as possible. Sometimes a single broadside was enough to cripple the enemy vessel.Stephen Biesty (ill.) and Richard Platt (author). (1993). Stephen Biesty's Cross-Sections Man-of-War. New York: Dorling Kindersley.
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