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A downrigger is a device used while fishing using the trolling method, which places a lure at the desired depth. A downrigger consists of a three to six-foot horizontal pole which supports a cannonball, generally 10 to 15 pounds, by a steel cable (generally stainless steel or wire).
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The first built-up gun was designed by French artillery officer Alfred Thiéry in 1834 and tested not later than 1840. Also about 1840 another one was made by Daniel Treadwell, and yet another one was produced by Mersey Iron Works in Liverpool according to the John Ericsson's design.
Cannon recovered from the sea are often extensively damaged from exposure to salt water; electrolytic reduction treatment is required to forestall corrosion. [218] The cannon is then washed in deionized water to remove the electrolyte, and is treated in tannic acid, which prevents further rust and gives the metal a bluish-black colour.
A diagram of the cannon, including the location of the touch hole A sculpture in Whitehaven depicting an American sailor in the act of spiking a cannon. A touch hole, also known as a cannon vent, is a small hole at the rear (breech) portion of the barrel of a muzzleloading gun or cannon.
Gun construction and rifling diagram This was an Elswick Ordnance export design, completely different from and longer (30-calibres, 183.5 inch bore) than the contemporary 26-calibres British naval service 6-inch Mk III, IV and VI guns designed by the Royal Gun Factory, although it fired the same 100-pound projectiles.
The parts of a cannon described, John Roberts, The Compleat Cannoniere, London 1652. A description of the Gunner's art is given during the English Civil War period (mid-17th century) by John Roberts, covering the modes of calculation and the ordnance pieces themselves, in his work The Compleat Cannoniere , printed London 1652 by W. Wilson and ...
From the 16th to the mid-19th century, the main form of artillery remained the smoothbore cannon.By this time, the trunnion (a short axle protruding from either side of the gun barrel) had been developed, with the result that the barrel could be held in two recesses in the carriage and secured with an iron band, the "capsquare".
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