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Show ELECTRICITY ON THE -BIG OCEAN LfPJERS The amount and variety of electrical electri-cal apparatus carried by any large ocean liner Is astounding. From tho wireless aerial suspended high abovo the upper deck to the cargo lamps in the lowest hold electricity is In con- j stant use. The usual electrical installation on I ji large linear, ooasUta. of four engines! J , and dynamos, each dynamo having a capacity of 400kw. at 400 volts. There are also auxiliary generating sets, consisting of two 30-kw engines and dynamos situated on a platform in the turbine engine room 20 feet above the water line. These auxiliary emergency sets are connected to tho boilers by means be temporarily out of action they can provide current for such lights and power appliances as would be required In the event of emergency. em-ergency. Working in conjunction with these emergency sets Is a battery with a capacity of 3500 amperehours, situated on tho promenade deck, forward for-ward of tho first-class smoke-room. The electric lighting on such a steamer Is equal to that of a good-sized good-sized town, the total number of incandescent in-candescent lights being about 110,000, ranging from S to 10 candle power. There are special dimming lamps In the first-class rooms, and the electric bell system includes 1700 bell pushes and 29 indicator boards distributed throughout the vessel, with fire alarm pushes distributed through the great liner and an alarm bell and Indicator In the chart room. There are electric heating, power and mechanical ventilation apparatus in service, altogether 1S8 motors and G05 electric heaters being installed throughout. The system of ventilation ventila-tion consists of electrically driven fans some suction, others pressure, and In many cases provided with steam colls for warming the air. Loud-speaking Loud-speaking telephones of navy pattern are fitted for communication between the wheel house on th'e bridge and forecastle and after-docking bridge, engine room and wireless room, and also in the chief engineer's cabin. Tho telephones aro operated both from the ship's lighting circuit, through a motor-gonerafor, and alternatively alter-natively by a stand-by storage battery, bat-tery, which is Introduced in the circuit, cir-cuit, should the main supply fall, by means of an automatic switch. There is also a separate telephono system for intercommunication between a number of the chief officials and service ser-vice rooms, through a 50-llne exchange switchboard. A number of the pantries pan-tries and galleys are also in direct telephonic communication. r The apparatus for wireless telegra- ' phy consists of a 5-kw. motor-gener- ator The house for the instruments is situated on the boat deck. Thete " are four parallel aerial wires extending extend-ing between the masts fastened to light brooms; from the aerlalsk connecting con-necting wires aro led to the Instruments Instru-ments in the house. There are two complete sets of apparatus, one for transmitting and one for receding messages, the latter being p'aced In a sound-proof chamber in one corner - . of the house. There isv also an Independent Inde-pendent storage battery and coll. For submarine signalling, apparatus , is provided for receiving signals from submerged bells. Small tanks con- H taining microphones are placed on the inside of the hull of the vessel on the port and starboard sides below water level, and connected by wires to re- celvers situated in the" port navigat ing room. The whistles are electric- .-ally .-ally actuated. The boiler-room tele- J graphs, stoking indicators, and a ( number of auxiliary appliances, such as rudder indicators, clocks -nd ther- j mostats, are also electrical, and the water-tight doors are released by electro-magnets, t ) There are complete emergency cir- t cults provided on all ocean liners. A I separate and distinct installation Is r fitted in all parts of tho vessel, derlv f ' ing current from two 30-kw sets and the 3500-ampere-hour batterj-, so that I in the event of current from the main dynamos being unavailable an Inde- f pendent supply is obtainable. Coa- f nected to the emergency circuit are t about 500 incandescent lamps, fitted j throughout all passonger, crew and machinery compartments, all the enn j of passages and near stairways; also f on boat deck, to enable anyone to , 1 find the way from ono part of tte I ship to the other The following are II also connected to the emorgency c H cuit by means of change-over switc' S es. Five arc lamps, seven cargo ad I gangway lauters, wireless apparatus. i boat davits, mast, side and sters . lights, and all lights on bridge, , p J I eluding those of navigating and cbtf I rooms, wheelhouse, telegraphs, co? S passes and Morse signalling lantart |