The German ironclad Prinz Hendrick, built by Laird Brothers of Birkenhead, and launched in October 1866, was barque-rigged, and was fitted with Captain Coles’ tripod masts. She was also fitted with revolving turrets, hinged bulwarks, and a sliding funnel.
The Hercules, begun in June 1866, and launched in February 1869, was one of the best specimens of the entirely iron-built, iron-armoured frigates the Navy possessed at that time. Her ram bow did not protrude so far as in former vessels and only weighed about five tons. The armour plating on the sides of the ship weighed 1145 tons. The total weight of metal worked into the ship was 4252 tons. The bulwarks were of wood, but below them the first two strakes were of plates 6 inches thick; next was a strake of 8-inch armour covering the lower portion of the main deck or central box battery; then two strakes of 6-inch armour, then a belt of 9-inch armour along the water-line, then a strake of 6-inch plates resting above the double skin of the hull itself. The 9-inch plates were backed by 10 inches of teak, inside of which was an iron skin 1¹⁄₂ in. thick, supported by vertical frames 10 inches deep and 2 feet apart, while further stiffening structures were also included. The engines worked up to over 7000 indicated horse-power. The vessel also afforded an illustration of the tendency to reduce the number of guns and increase their weight. To add to her steering capacities she had a balanced rudder which was itself jointed and hinged upon the line of pivot.
H.M.S. “Dreadnought.”
The carrying of such quantities of armour was against the maintenance of high speed at sea, and accordingly the unarmoured iron frigate Inconstant was launched later in the same year. She carried sixteen guns and was faster than any other warship afloat.
The Prussian ironclad Koenig Wilhelm, built by the Thames Iron Works and Shipbuilding Company, from designs by Mr. E. J. Reid, in 1869, was commenced for the Turkish Government, and was built on the longitudinal system, having a series of wrought-iron girders or frames extending from end to end of the ship. There was an inner skin on the inner sides of the frames and ribs, as though one ship was inside another. She was then the heaviest vessel ever docked in the Thames, as she weighed 8500 tons. Her armour was 8 inches thick amidships and tapered slightly towards the ends.
The year 1869 was remarkable for the introduction into the British Navy of large ironclads without masts or sails and relying upon steam alone for their propulsion, and these vessels also demonstrated the most perfect form then understood of the turret ship as applied to a sea-going warship of large capacity. The Devastation, built at Portsmouth, and the Thunderer at Pembroke, were the first of this class, and were claimed to be more formidable than any other warships in existence both for offence and defence. They were each of 285 feet in length and 4406 tons, as compared with the first ironclad Warrior, 380 feet and 6019 tons, and the Minotaur, of 400 feet length and 6021 tons. The Warrior’s armour was 4¹⁄₂ inches of hammered plate that would break under the impact of heavy shot; that of the Minotaur was 5¹⁄₂ inches of rolled armour, in each vessel there being a strong backing of teak and iron plating built into the frame. The two turret ships had 12 inches of rolled armour plating on a teak backing built into an immensely strong framing 18 inches thick, and the whole was backed up with an inner skin of iron plating 1¹⁄₂ inches thick. The thickest armour then in use in the French Navy was 8¹⁄₄ inches and was carried only by rams of the Bélier class. These vessels also included an improvement in the bracket-frame system of construction, first introduced in the Bellerophon by Mr. Reid. The “breastwork monitor” of the Devastation type was regarded as an improvement on the American types of monitors. The turrets were mounted on Captain Coles’ system and each turret carried two 30-ton guns. The ships were driven by independent twin-screws and had a speed of 12¹⁄₂ knots.
In 1870 the ill-fated Captain was lost. She was designed by Captain Coles and built by Messrs. Laird as a sea-going turret vessel. The principal armament was four 25-ton Armstrong guns carried in two turrets, one fore and one aft; these turrets were 27 feet diameter outside and 22¹⁄₂ feet inside, half the thickness of the wall consisting of iron plating. This ship behaved admirably on her trials and also on an experimental cruise, and was sent to sea with the fleet in September of that year. From some reason never explained satisfactorily she capsized without warning, and went down in a few seconds during a gale in the Bay of Biscay before daylight on the morning of September 7. Only nineteen of the 500 persons on board were saved, among the drowned being Captain Coles himself.
This disaster evoked such an amount of criticism as to the vessel’s stability and seaworthiness that no more of the type were constructed, the turret ships subsequently built being modifications of the principle.
