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. SPEER OR ee CE oo eT PTT nee Aa eR a ee TIRE PEI I Bae SEPT Sy TaN Ra Ne EL DLA pee ea ery ee aye ks Se REE SET TS a Dae ee ere ter The weight of the L. P. rotor is about 125 tons and the H, P. rotor 72 tons, and these can be lifted in 30 minutes. One of the best illustrations of the adaptability and usefulness of electric motors on board ship is to be found in the case of the electrically-con- trolled sluice valves. There are two 75-in. and two 60-in. sluice valves in connection with the high-pressure tur- bine exhaust steam, and in each of these is fitted' a 12-H:-P: motor oper- ating a worm gear. Each is controlled from switches on the - starting plat- form, where an index shows the action of the valve. The fact that the valves can be closed in a minute or two by the electric motor, and that it would take four men two and one-half hours to close it by hand, shows a remark- able saving in time and labor in favor of the electric motor. Other useful applications of the electric motor in the engine room is the 30-H. P. mo- tors installed for the turning gear, and 25-H. P. motors which drive centrifu- gal pumps drawing off surplus water from the condensers. For ventilating the engine room there ate 10 Sirocco fans of 25 in. diameter, each driven by a 5-H. P. motor; six fans of 30 in. diameter, each driven by a 30-H. P. motor; and four fans of 15 in. diameter coupled - to 1%4-H. P. motors. The general heating and ventilating of the ship is maintained by 53 ther- mo-tanks, each fitted with a motor- driven fan, the motors varying from 2% to 4H. P., making a total of 156 H. P. Each motor fan supplies a sec- tion of the ship with warm or cold air, or by arrangement of valves on the tanks, the fans can be made to extract the air from various compartments. DECK WINCHES AND OTHER APPLIANCES. Electric power driving is also ex- tensively used for deck winches, pas- senger hoists, and other appliances to the extent of 270 H. P. For the passenger lift, two motors of 8 H. P. supply the power to the winding gear, while other two motors of 15 H. P. supply the power for 40- cwt. baggage hoists, and two 5-H. P. motors operate two 10-cwt. store hoists, while two more of 14 H. P. contro] the two 2-cwt. pantry hoists for conveying food from the kitchen. There are also two mail hoists fitted with 12-H. P. motors. In addition to these there are four electric jib cranes, each made to lift 12 cwt. The lifting motions are oper- ated by a 12-H. P. motor through worm gear, and the slewing motion through worm and spur gearing by a 2%4-H. P. motor, the motors being se- "THE Marine REVIEW ries wound of the enclosed type. These cranes do their work absolutely with- out noise of any kind and are con- veniently placed on the boat deck for lifting stores, or luggage and mails from tenders that come alongside. Another important part performed by electric power is the hoisting and lowering of the lifeboats. This work is done by four electric winches placed alongside the lifeboats. The motors attached to these winches 'are each of 27 H. P., connected to worm gear running in an oil bath. The rapidity with which the lifeboats can be manip- ulated, as compared by hand, must be apparent to all. An interesting application of elec- tric driving is in connection with the refrigerating machinery. The two gas compressors are each coupled direct to a 12-pole shunt- wound motor Of 35 TEP, siviig a constant. torque between 40 and 110 R. P. M. The armature is provided with two windings which are in series at starting, and by turning the hand wheel on the switch gear, the starting resistance is cut out and a variable re- sistance inserted in the shunt circuit to regulate the speed between 35 and 75 RR. P.M: - By 'transposime the armature windings from series to par- allel connections without resistance, and by inserting the shunt resistance again, the speed can 'be increased to 110 R. P. M. The two brine pumps are operated by shunt-wound motors Of 064 m1, Ey enen. In addition to the large number of motors already enumerated, there are still a great number of other applica- tions, but time will only permit me to refer to them briefly. Among these are the motors for driving the printing machine and the Marconi. apparatus of 5 and .3 H..P,, respectively, and provision is made by having connections on deck for driv- ing winches of 112 H. P. on the quay or in barges. In the galleys and cook- ing department an_ electric motor drives a machine capable of making 'bread for 3,000 people; and in the cooking ovens there are four vertical spits, driven electrically, capable of dealing with a % ton of meat at a time. Other motors are fitted to knife- cleaning machines, dish-washing ma- chines, circular knives for cutting ba- con, potato peelers, whisking machine, freezing machines for making ice cream, and numerous electric hot plates for keeping food warm during' service. TELEPHONE AND ELECTRIC BELL SYSTEM. Telephone instruments are fitted throughout the first class state rooms. 35 Having an exchange on board, passen- gers can converse with one another without leaving their rooms. On ar- rival in port the exchange is connect- ed to the Liverpool or New York exchange, so that passengers may be in communication with their homes or offices up till the hour of sailing or immediately on arrival. Another telephone system connects the captain and officers on watch on_ the bridge with the engine rooms and crow's nest on the foremast. These consist of Graham's mnavy-pattern loud- speaking telephones, and are used for docking and steering as well, connec- tions being fitted on the forecastle, in the wheel house aft, and in the steer- ing-gear room at the stern of the ship. For the officers' use there is an inter- communication telephone service fit- ted, consisting of the Parsons Sloper secret, instruments, each. officer being able to call up another from his own room. : : In addition to the telephone system there is a large installation of electric bells with Gents' patent indicators. In every first class state room there is a combination fitting of electric bell push, electric light switch, connection for portable reading lamp or curling tongs heater, and electric fans, while a number of special rooms are fitted with electric radiators. A complete installation of electric clocks is fitted on the magnetic sys- fem. In the. public rooms, and prin- cipal entrances, and corridors there are fitted, in all, 48 clocks, controlled from the master clock, situated in the chart room adjoining the bridge. There is also a complete electric fire alarm system. A brass plate and red lamp indicate the position of the alarm push in the corridors, these be- ing connected to indicators in the en- gine room and the navigating house on the bridge deck. There ig also a subsidiary fire alarm apparatus fitted near the bridge, consisting of a small cabinet into which a number of tubes are led from the various holds, a small electrically-driven fan continually ex- hausts the air from the tubes, and in the event of a fire it would be easily detected from which hold the smoke issued. A mercury-contact type fire alarm indicator is also fitted in the case, which, with the rising tempera- ture, rings an alarm bell. In addition to the ordinary life buoys, there are two special buoys fit- ted on the bridge deck operated by Martin's electric release gear, which can be operated from the bridge and other positions, on the alarm being raised.