Lighthouse Battery - consisted of three guns housed within two circular pits and a third, open-backed, circular pit. The cannon above is one of nine Mark III rifled muzzle loading guns (RML's) mounted upon disappearing Moncrieff carriages built at the Royal Gun Foundry, Woolwich having been designed by Sir William Armstrong. One gun on the island is dated 1859 on the trunnion.
The RML 7-inch caliber, 7 ton guns, consisted of a steel rifle tube surrounded by wrought iron coils and had an overall length of 142 inches. They used a 115 lb. Palliser shell and were mounted on the Moncrieff disappearing carriage. The shells exploded upon impact and their high velocity ensured that they could pierce iron-clad warships of the time. Typically, the shell could penetrate eight inches of iron-plate armour at a distance of 3,300 feet!
These guns were never fired in defence, only for test purposes. [001] [1318]
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