HMS Captain was a major warship built for the Royal Navy as a semi-private venture, following a dispute between the designer and the Admiralty. With wrought-iron armour, steam propulsion, and the main battery mounted in rotating armoured turrets, the ship was, at first appearance, quite innovative and formidable. However, poor design and design changes resulted in a vessel that was overweight and ultimately unstable. In terms of seaworthiness she was reported as closely comparable to the higher freeboard turret-ship HMS Monarch, but her reduced freeboard added a sense of "sluggishness". The Captain capsized in heavy seas, only five months after being commissioned, with the loss of nearly 500 lives.
Background The history of the Captain can be traced back to the Crimean War and the experiences of British captain Cowper Phipps Coles in 1855. Coles and a group of British sailors constructed a raft with guns protected by a "cupola" and used the raft, named the Lady Nancy, to shell the Russian town of Taganrog on the Sea of Azov. The Lady Nancy "proved a great success", and Coles patented his rotating turret after the war. Following Coles' patenting, the British Admiralty ordered a prototype of Coles' design in 1859, which was installed in the floating battery vessel, HMS Trusty, for trials in 1861. The trials with the Trusty impressed the Admiralty, and it ordered a coastal defence vessel, HMS Prince Albert, to be built with four of Coles' turrets and a wooden 121-gun first rate ship-of-the-line under construction, HMS Royal Sovereign, to be converted to a turret ship. The Prince Albert was completed with four turrets mounting single 12-ton 9-inch guns and 4.5-inch-thick (110 mm) armour plate on the hull. The Royal Sovereign had five 10.5-inch, 12.5-ton guns in one twin and three single turrets. Both ships were flush deck with only a jury rig, and could only operate as coastal service vessels. The Admiralty, although impressed with Coles' rotating turret, required oceangoing vessels to protect its worldwide empire. Unfortunately for Coles, engine technology had not yet caught up with his designs and consequently oceangoing ships required sails. Combining rigging, masts, and turrets proved complicated if rigging was not to impede the turrets' arcs of fire. In early 1863 the Admiralty gave Coles permission to work with Nathaniel Barnaby, head of staff of the Department of Naval Construction, on the design of a rigged vessel with two turrets and three tripod masts. In June 1863 the Admiralty suspended progress on the vessel until the Royal Sovereign finished her trials. In 1864, Coles was allowed to start a second project: a rigged vessel with only one turret and based on the design of HMS Pallas. He was lent the services of Joseph Scullard, Chief Draughtsman of Portsmouth Dockyard. The next year, 1865, a committee established by the Admiralty to study the new design concluded that while the turret should be adopted, Coles' one-turret warship design had inadequate fire arcs. The committee proposed a two-turret fully rigged vessel with either two 9-inch (12 ton) guns per turret, or one 12-inch (22 ton) gun per turret. The committee's proposal was accepted by the Admiralty, and construction was started on Monarch. Monarch's two turrets were each equipped with two 12-inch (25-ton) guns.
Stunned by the committee's decision to cancel his single-turret ship and his proposal for a two-turret vessel, and objecting to the Monarch's design, Coles launched a strong campaign against the project, attacking Vice Admiral Robert Spencer Robinson, Controller of the Navy, and various other members of the committee and the Admiralty. So vociferously did Coles complain that in January 1866 his contract as a consultant to the Admiralty was terminated. At the end of January, his protestations that he had been misunderstood led to his being re-employed from 1 March 1866. Further, Coles lobbied the press and Parliament, who were increasingly convinced that foreign powers—namely the United States—were pressing ahead with turret ships and thereby leaving Britain at a disadvantage at sea. On 17 April 1866, Coles submitted to the Admiralty his critique of the proposed Monarch (designed by the Controller's department and the Chief Constructor), stating that he could not publicly endorse a vessel which did not represent "my views of a sea going Turret-ship, nor can she give my principle a satisfactory and conclusive trial." Sensing that such an increasingly acrimonious and high-profile debate would only continue, the First Naval Lord, Admiral Sir Frederick Grey, minuted four days later (21 April) that Coles should at last be allowed to build what he felt would be a 'perfect' seagoing turret-ship.
Design and construction
On 8 May 1866, Coles informed the Admiralty of his selection of Laird Brothers' Cheshire yard, for the builder of the warship. The Cheshire yard had already built several successful iron warships. In mid-July, Lairds submitted two possible designs for Coles' proposed turret-ship. To prevent the rigging from being damaged when the guns fired through it, it was attached to a platform mounted above the gun turrets known as the hurricane deck instead of brought down to the main deck. Tripod masts were also used to minimise standing rigging.
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