All the plating of the hulls was riveted by hydraulic power, driving seven-ton riveting machines, suspended from traveling cranes. The double bottom extended the full length of the vessel, varying from 5 feet 3 inches to 6 feet 3 inches in depth, and lent added strength to the hull. MOST LUXURIOUS STEAMSHIP Not only was the Titanic the largest steamship afloat but it was the most luxurious. Elaborately furnished cabins opened onto her eleven decks, and some of these decks were reserved as private promenades that were engaged with the best suites. One of these suites was sold for $4350 for the boat's maiden and only voyage. Suites similar, but which were without the private promenade decks, sold for $2300. The Titanic differed in some respects from her sister ship. The Olympic has a lower promenade deck, but in the Titanic's case the staterooms were brought out flush with the outside of the superstructure, and the rooms themselves made much larger. The sitting rooms of some of the suites on this deck were 15 x 15 feet. The restaurant was much larger than that of the Olympic and it had a novelty in the shape of a private promenade deck on the starboard side, to be used exclusively by its patrons. Adjoining it was a reception room, where hosts and hostesses could meet their guests. Two private promenades were connected with the two most luxurious suites on the ship. The suites were situated about amidships, one on either side of the vessel, and each was about fifty feet long. One of the suites comprised a sitting room, two bedrooms and a bath. These private promenades were expensive luxuries. The cost figured out something like forty dollars a front foot for a six days' voyage. They, with the suites to which they are attached, were the most expensive transatlantic accommodations yet offered. THE ENGINE ROOM The engine room was divided into two sections, one given to the reciprocating engines and the other to the turbines. There were two sets of the reciprocating kind, one working each of the wing propellers through a four-cylinder triple expansion, direct acting inverted engine. Each set could generate 15,000 indicated horse-power at seventy-five revolutions a minute. The Parsons type turbine takes steam from the reciprocating engines, and by developing a horse-power of 16,000 at 165 revolutions a minute works the third of the ship's propellers, the one directly under the rudder. Of the four funnels of the vessel three were connected with the engine room, and the fourth or after funnel for ventilating the ship including the gallery.