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by simply shutting off the unit in question. Most lighting services on_ ship- board are either 115 volts or 2380 volts. The 115-volt system is to be preferred. Incandescent lamps of this voltage are cheaper, resist shock and vibration better, and are more easily obtained as standard supplies. The problem of electrical insulation is also easier. The Edison screw base is standard on American ships. Again the ease of obtaining the lamps and_ the cheaper price are important factors in making them so. Some English and Scandinavian ships, however, use the bayonet base. Its main feature is the fact that it cannot automat- ically unscrew from a socket. How- ever, the ordinary screw base will not unscrew either except under the most severe vibration over a long period of time. As mentioned earlier in the article, FIG. 8 A—ANGLE TYPE OF REFLECTOR FOR LIGHTING VERTICAL SURFACES all fixtures and wiring material must be specially protected. The exact specifications are listed in various un- derwriters’ codes and in a_ booklet published by the American Institute To Use Geared Turbines and freight vessel recently con- tracted for with the Union plant of the Bethlehem Shipbuilding Corp. by the Inter-Island Steam Navigation Co., will be propelled by geared tur- bines, with steam supplied by water tube boilers. All of the machinery including the main propulsion geared turbines, con- densing equipment, auxiliary turbine generators, electric galley equipment, fans, electric motors for blowers, etc. have been ordered complete from the Westinghouse Electric & Mfg. Co. The general particulars of the vessel are: Displacement, 4070 tons; dead- weight capacity, approximately 1800 tons, 11,600 cubic feet of refrigerator space; length overall, 310 feet 10 T HE new twin screw passenger inches; length between perpendiculars, 295 feet; beam, 48 feet; depth molded to shelter deck, 27 feet 6 inches; sea speed, 15 knots, with a maximum of 16 knots; and a total of 4000 shaft horsepower. There will be four water tube boilers, burning oil. The fuel capacity is to be 530 tons and the fresh water capacity 146 tons. Accommodations will be provided for 218 first class and 96 steerage passen- gers and a crew of 67. There will be two continuous steel decks and the machinery will be located amidships, with watertight bulkheads surround- ing the engine and boiler spaces. The hold will be divided into two com- partments forward and a single com- partment. aft. The vessel will be built with a straight stem, cruiser stern, flat keel, and will be rigged with two steel pole masts, the mainmast to be fitted with two three-ton cargo booms and the foremost will be fitted with two five-ton and one 20-ton boom. Two phases of this vessel contract of Electrical Engineers entitled “Recommended Practice for Electrical. Installations on Shipboard.” The. latest edition of the latter booklet is dated May, 1927. Protected Cables and Fixtures In the engine rooms and _ similar spaces, all conductors should be leaded and armored, the lead protecting the conductor from the action of moisture and the outside armor (usually steel) from mechanical breakage. The lighting fixture should be made. of non-corrodible material and should be rendered watertight by means of a glass globe. ‘The globe should be. protected by a substantial guard. The watertight globe should be flanged or threaded to fit the outlet box. Various examples of such units are. pictured here. Most manufacturers. supply the globes either clear or frosted. For large lamps mounted fairly low, it is advisable to use the frosted globe. in New Boat | amounting to approximately $1,400,- 000 are of particular interest. The first is the owner’s confidence in geared turbine machinery and_ his progressiveness in taking advantage of the merits of this type of machin- ery in conjunction with electrical aux- iliaries. The second is the fact that this is the first of the larger type vessels to be contracted for with a West coast shipyard in a number of years indicating that the Eastern shipyards may now expect more seri- ous competition from West coast yards. / The new vessel is to operate be- tween various ports in the Hawaiian : Islands and reliability of the ma-. chinery was one of the matters given special consideration. Specifications | were prepared by A. C. Dieriex, vice president and general manager of the Matson Navigation Co. in collaboration MATSON LINER—MAUI, TWIN SCREW GEARED TURBINE PASSENGER AND FREIGHT STEAMER FRANCISCO AND HONOLULU MARINE REVIEW—September, 1927 IN SERVICE BETWEEN