abstract
| - The Caledonia-class ships of the line were a class of nine 120-gun first rates, designed for the Royal Navy by Sir William Rule. A tenth ship (Royal Frederick) was ordered on 29 October 1827 to the same design, but was launched in 1833 as the Queen to a fresh design by Sir William Symonds. The armament remained the same for the first three ships of the class, with the exception of an increase in firepower on the poop deck from 2 to 6 18-pdr carronades. The armament for the fourth ship was significantly modified, with two of the 32-pdrs on the main gun deck being replaced with 68-pdr carronades, all guns on the middle and upper gun decks being replaced with the same number of 32-pdrs, four of the 12-pdr guns on the quarterdeck were replaced with 32-pdr carronades, and the remaining two were increased to 18-pdrs, along with the two 12-pdrs on the forecastle, and the carronades on the poop deck were removed. The remaining five ships were built to a slightly broadened version of the draught, and this sub-class was armed in the same way as the last of the standard Caledonias, HMS Royal George. Except for the Caledonia herself, all these ships were converted into steam-powered screw battleships during the 1850s.
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