It is generally accepted that the first bomb vessels were built at the end of the 17th century, based on the designs of Bernard Renau d'Eliçagaray, and used by the French Navy. They were first called gáliote à bombe (a word derived from the Dutch galliot denoting a short, beamy vessel well suited for the powerful downwards recoil). Five such vessels were used to shell Algiers in 1682 destroying the land forts, and killing some 700 defenders. Two years later the French repeated their success at Genoa. The early French bomb vessels had two forward-pointing mortars fixed side-by-side on the foredeck. To aim these weapons, the entire ship was rotated by letting out or pulling in a spring anchor. The range was usually controlled by adjusting the gunpowder charge. The French later adopted the word bombarde for this vessel, but it should not to be confused with the horizontal fire, stone throwing bombard of earlier centuries.
The French design was copied by the Royal Navy, who continued to refine the class over the next century or more, after Huguenot exiles brought designs over to England and the United Provinces. The side-by-side, forward-pointing mortars were replaced in the British designs by mortars mounted on the centerline on revolving platforms. These platforms were supported by strong internal wooden framework to transmit the forces of firing the weapons to the hull. The interstices of the framework were used as storage areas for ammunition.
Early bomb vessels were rigged as ketches with two masts. They were awkward vessels to handle, in part because bomb ketches typically had the masts stepped farther aft than would have been normal in other vessels of similar rig, in order to accommodate the mortars forward and provide a clear area for their forwards fire. As a result, by the 1800s British bomb vessels were designed as full rigged ships with three masts, and two mortars, one between each neighboring pair of masts. Bomb vessels often had the front rigging made of chain, to better withstand the muzzle blast of the mortars.
Mortars were the only kind of naval armament to fire explosive shells rather than solid shot. Since it was considered dangerous to have large stocks of shells on board the ships that were firing them, and because the reinforced mortar platforms occupied so much space below decks, bomb vessels were usually accompanied by a tender to carry ammunition as well as the ordnance officers in charge of firing the mortars.However as naval warfare became more advanced 'Bomb Ships' were also accompanied by normal cannon holding frigates to protect them from direct assault, by faster, smaller vessels.
Bomb vessels were traditionally named after volcanoes, or given other names suggestive of explosive qualities. Some were also given names associated with the underworld. Vessels of other types which were later converted to bombs generally retained their original names.
Bomb vessels were highly specialized and expensive to fit out and maintain, and only marginally suited for their secondary role as cruisers. Because bomb vessels were built with extremely strong hulls to withstand the recoil of the mortars, several were converted in peacetime as ships for exploration of the Arctic and Antarctic regions, where pack ice and icebergs were a constant menace. Most famously, these ships included HMS Erebus and HMS Terror. In this case, the volcanoes – Mount Erebus and Mount Terror on Ross Island in Antarctica – were named after the ships, instead of vice-versa.
Although horizontal fire naval guns propelling explosive shells had entered all major navies by the 1840s (see Paixhans gun), there was still room for a specialized vessel on occasion. During the American Civil War, the Union fleet included armored gunboats armed with 13 inch mortars; the weapon weighed 17,250 lbs and its bedding another 4,500 lbs. They fired 204-lb shells, with a bursting charge of 7 lbs of gunpowder, and had a range of three miles. At this distance, the projectile spent 30 seconds in flight. They were used to attack several forts, for example Fort Pulaski, Georgia.
Read more about this topic: Bomb Vessels
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