The engines of H.M. steam-frigate Warrior, 1861. This vessel, the first completed of our new iron-clad ships-of-war, and by far the noblest and most efficient fighting-ship in commission in the world...The rapidity with which the works have been carried on since the ship was launched is most creditable to the contractors, the Thames Shipbuilding Company, and the manner in which the whole of the works of a novel and exceedingly difficult character have been executed has given perfect satisfaction to the inspectors appointed by the Government... The shell or framework of the Warrior is formed of wrought scrap iron...she is not only iron-clad, but she is throughout constructed of iron, and there will be, therefore, no trouble about unseasoned or decaying timber in any part of her structure...The Warrior is fitted with Messrs. John Penn and Sons patent trunk-engines, of 1250-horse power, similar in construction to those fitted be many of her Majestys ships, having two cylinders of 112 in. diameter each, with 4 ft. length of stroke, and are intended to make about fifty-five revolutions per minute. About 130 ft. of wrought-iron shafting, of 17 in. diameter, intervene between the engines and the screw. From "Illustrated London News", 1861.