Launch of the Turkish iron-clad frigate Sultan Mahmoud, at the Thames Ironworks, Blackwall, 1864. Ship ...built for the Sultan of Turkey by the Thames Ironworks Company...of 4221 tons burden; its length being 253 ft. 9 in.; breadth, 55 ft. 11 in...Its internal construction is immensely strong...Above the lower section, or joints of the vertical ribs, there are longitudinal girders, which stretch along the whole length of the sides, and unite at the bow and stern...The armament will consist of eighteen 7-ton guns - nine on each side, and each carrying a 150 lb. ball; and on the upper deck there will be a 12-ton gun at the bows, with a calibre for 300-pounders. In addition to the attacking power which she will carry in her guns, the Sultan Mahmoud is also provided with a formidable means of offence in the shape of a large advanced prow...The circular bow...is strengthened by some very heavy forgings and metal-work, it would administer a very destructive blow to any vessel that it might run into when under steam. The anticipated speed of the vessel will be about 13 knots. The engines of the Sultan Mahmoud are to be of 900-horse power, and are to be manufactured by Messrs. Salkeld and Co. From "Illustrated London News", 1864.