The Nemesis was at length finished, and sent to sea as a private armed steamer. She was never commissioned under the articles of war, although commanded principally by officers belonging to the Royal Navy; neither was she classed among the ships of the regular navy of the East India Company. In short, the Nemesis was equipped under very peculiar circumstances, which, together with the novelty of her construction, caused her to become an object of very general interest. The "_wooden_ walls" of England had, in fact, been so long identified with her proudest recollections, and had constituted for so many centuries her national "boast," that it seemed an almost _unnational_ innovation to attempt to build them of iron. Indeed, it was rather looked upon as one of the dangerous experiments of modern days. Moreover, as the _floating_ property of wood, without reference to its shape or fashion, rendered it the most natural material for the construction of ships, so did the _sinking_ property of iron make it appear, at first sight, very ill adapted for a similar purpose. It was sometimes forgotten that even wooden ships are composed of wood, iron, and copper together, and that the bulkiness of these necessary materials greatly diminishes the buoyancy of the wood. A minute and scientific description of the structure of the Nemesis will be found in the United Service Journal for May, 1840, and it will therefore be sufficient, in this place, merely to notice one or two peculiarities, in which it differs from that of wooden ships in general. With the exception of the great paddle-beams, across the ship, and the _planks_ of the deck and the cabin-fittings, together with one or two other parts, the names of which would be only intelligible to the scientific reader, the whole vessel was built of iron. Credit is due to Mr. Laird, of the Birkenhead Iron Works, Liverpool, for the admirable manner in which she was constructed, and for the elegance of her form and model, which fully answered every purpose required of her. Her burden was about 680 tons, and her engines of 120-horse power, constructed by Messrs. Forrester and Co., also of Liverpool; and with twelve days' supply of coals, together with water and provisions for four months, and stores of all sorts for two years, with duplicate machinery, &c., and all her armament complete, her mean load draught of water was only _six feet_. But commonly, in actual service, she drew little more than five feet. Her length over all was 184 feet, her breadth 29 feet, and her depth 11 feet. Her keel-plate was laid, and the vessel built and launched, in the short space of three months.