Somerset cannon
Encyclopedia
The Somerset cannon was a British cannon designed within the Admiralty
Admiralty
The Admiralty was formerly the authority in the Kingdom of England, and later in the United Kingdom, responsible for the command of the Royal Navy...

 and manufactured by Armstrong's
Armstrong Whitworth
Sir W G Armstrong Whitworth & Co Ltd was a major British manufacturing company of the early years of the 20th century. Headquartered in Elswick, Newcastle upon Tyne, Armstrong Whitworth engaged in the construction of armaments, ships, locomotives, automobiles, and aircraft.-History:In 1847,...

.

Its genesis was the unexpected failure of the Armstrong breech-loading rifles recently developed and installed on Royal Navy
Royal Navy
The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

 ships. The Somerset was a 6.5 ton 9.2-inch calibre smoothbore muzzle-loader, firing a 100-pound shot. With a charge of 33 pounds of gunpowder, a steel shot could penetrate 5.5 inches of armour at 800 yards.

Providing a mounting which could reliably be worked at sea proved difficult for a piece of this size. Traditional truck carriages were inadequate; historical research revealed that a carriage which was suitable had been suggested by Captain Sir Thomas Hardy (Nelson
Horatio Nelson, 1st Viscount Nelson
Horatio Nelson, 1st Viscount Nelson, 1st Duke of Bronté, KB was a flag officer famous for his service in the Royal Navy, particularly during the Napoleonic Wars. He was noted for his inspirational leadership and superb grasp of strategy and unconventional tactics, which resulted in a number of...

's Flag Captain) many years before. In this system the gun-carriage remained stationary, and the recoil of the gun was absorbed by a system of sliding friction blocks attached to the carriage and to the gun.

The gun was issued for service, and was mounted in , , and , but its performance was so poor, largely due to difficulties in controlling the gun, that it was withdrawn from service.
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