The Loss of the S.S. Titanic: Its Story and Its Lessons, by One of the Survivors

The considerations that inspired the builders to design the Titanic on the lines on which she was constructed were those of speed, weight of displacement, passenger and cargo accommodation. High speed is very expensive, because the initial cost of the necessary powerful machinery is enormous, the running expenses entailed very heavy, and passenger and cargo accommodation have to be fined down to make the resistance through the water as little as possible and to keep the weight down. An increase in size brings a builder at once into conflict with the question of dock and harbour accommodation at the ports she will touch: if her total displacement is very great while the lines are kept slender for speed, the draught limit may be exceeded. The Titanic, therefore, was built on broader lines than the ocean racers, increasing the total displacement; but because of the broader build, she was able to keep within the draught limit at each port she visited. At the same time she was able to accommodate more passengers and cargo, and thereby increase largely her earning capacity. A comparison between the Mauretania and the Titanic illustrates the difference in these respects:—

-	Displacement	Horse power	Speed in knots
Mauretania	44,640	70,000	26
Titanic	60,000	46,000	21

The vessel when completed was 883 feet long, 92 1/2 feet broad; her height from keel to bridge was 104 feet. She had 8 steel decks, a cellular double bottom, 5 1/4 feet through (the inner and outer “skins” so-called), and with bilge keels projecting 2 feet for 300 feet of her length amidships. These latter were intended to lessen the tendency to roll in a sea; they no doubt did so very well, but, as it happened, they proved to be a weakness, for this was the first portion of the ship touched by the iceberg and it has been suggested that the keels were forced inwards by the collision and made the work of smashing in the two “skins” a more simple matter. Not that the final result would have been any different.

Her machinery was an expression of the latest progress in marine engineering, being a combination of reciprocating engines with Parsons’s low-pressure turbine engine,—a combination which gives increased power with the same steam consumption, an advance on the use of reciprocating engines alone. The reciprocating engines drove the wing-propellers and the turbine a mid-propeller, making her a triple-screw vessel. To drive these engines she had 29 enormous boilers and 159 furnaces. Three elliptical funnels, 24 feet 6 inches in the widest diameter, took away smoke and water gases; the fourth one was a dummy for ventilation.

She was fitted with 16 lifeboats 30 feet long, swung on davits of the Welin double-acting type. These davits are specially designed for dealing with two, and, where necessary, three, sets of lifeboats,—i.e., 48 altogether; more than enough to have saved every soul on board on the night of the collision. She was divided into 16 compartments by 15 transverse watertight bulkheads reaching from the double bottom to the upper deck in the forward end and to the saloon deck in the after end (Fig. 2), in both cases well above the water line. Communication between the engine rooms and boiler rooms was through watertight doors, which could all be closed instantly from the captain’s bridge: a single switch, controlling powerful electro-magnets, operated them. They could also be closed by hand with a lever, and in case the floor below them was flooded by accident, a float underneath the flooring shut them automatically. These compartments were so designed that if the two largest were flooded with water—a most unlikely contingency in the ordinary way—the ship would still be quite safe. Of course, more than two were flooded the night of the collision, but exactly how many is not yet thoroughly established.