Of the Titanic tragedy, Marconi said:
“I know you will all understand when I say that I entertain a deep feeling of gratitude because of the fact that wireless telegraphy has again contributed to the saving of life.”
WATER-TIGHT BULKHEADS
One of the most essential factors in making ships safe is the construction of proper bulkheads to divide a ship into water-tight compartments in case of injury to her hull. Of the modern means of forming such compartments, and of the complete and automatic devices for operating the water-tight doors which connect them, a full explanation has already been given in the description of the Titanic’s physical features, to which the reader is referred. A wise precaution usually taken in the case of twin and triple screw ships is to arrange the bulkheads so that each engine is in a separate compartment, as is also each boiler or bank of boilers and each coal bunker.
SUBMARINE SIGNALS
Then there are submarine signals to tell of near-by vessels or shores. This signal arrangement includes a small tank on either side of the vessel, just below the water line. Within each is a microphone with wires leading to the bridge. If the vessel is near any other or approaching shore, the sounds conveyed through the water from the distant object are heard through the receiver of the microphone. These arrangements are called the ship’s ears, and whether the sounds come from one side of the vessel or the other, the officers can tell the location of the shore or ship near by. If both ears record, the object is ahead.
LIFE-BOATS AND RAFTS
The construction of life-boats adapts them for very rough weather. The chief essentials, of course, are ease in launching, strength in withstanding rough water and bumping when beached; also strength to withstand striking against wreckage or a ship’s side; carrying capacity and lightness. Those carried on board ship are lighter than those used in life-saving service on shore. Safety is provided by air-tight tanks which insure buoyancy in case the boat is filled with water. They have also self-righting power in case of being overturned; likewise self-emptying power. Life-boats are usually of the whale-boat type, with copper air-tight tanks along the side beneath the thwarts, and in the ends.
Life-boats range from twenty-four to thirty feet in length and carry from thirty to sixty persons. The rafts carry from twenty to forty persons. The old-fashioned round bar davits can be got for $100 to $150 a set. The new style davits, quick launchers in type, come as low as $400 a set.
According to some naval constructors, an ocean steamship can carry in davits enough boats to take care of all the passengers and crew, it being simply a question as to whether the steamship owners are willing to take up that much deck room which otherwise would be used for lounging chairs or for a promenade.