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126 MARINE REVIEW \ SHOWING HOW DECKLOAD OF LUMBER IS CONVENIENTLY STOWED IN WAY OF RAISED DECK PLATFORMS thing over $30,000 a year saving in op- erating cost of the motorship over that for the similar steamship. Taking the lower cost suggested will, of course, considerably increase the margin of sav- ing due to operating costs. Over and zbove this would be the chance of car- rying considerably more cargo or a small amount of additional cargo and a much greater steaming radius. Better terms than those indicated above for the nec- essary capital can no doubt be arranged by use of the shipping board fund for such or like purposes. Equip Diesel-Electric Dredge for Lake Use The first commercial, privately owned diesel-electric hopper dredge will be put into operation on the Great Lakes by the Construction Materials Co., Chicago, during 1924. Orders have been placed with the General Electric Co. for com- plete electrical equipment to be installed in the Lake WeEtrr, which will be con- verted for this purpose. The Construc- tion Materials Co. will use the boat for dredging and also for transporting and delivering construction materials for building purposes. The boat will be the first diesel-electric dredge in oper- ation on the Great Lakes. The propulsion equipment consists of two 600 brake horsepower diesel en- gines built by the Worthington Pump & Machinery Corp.,. New York, each di- rect-connected to a 400-kilowatt main generator and a 35 kilowatt auxiliary generator. Under normal operating con- ditions, each main generator will drive April, 1924 a 500-horsepower motor direct-connect- ed to a propeller, the craft being of the twin-screw type. Ward-Leonard con- trol will be used, providing independent control of each propelling motor and arranged for operation from either the pilot house or engine room. Provision will also be made for operating both propelling motors from one generator. One auxiliary generator will furnish excitation for the motors and genera- tors and the other will be used for fur- nishing power for driving the engine room auxiliary motors, steering gear and lighting. All the auxiliaries will be electrically driven. In addition to the propelling equip- ment,. two 400-horsepower, motor-driven dredging pumps will be provided. The power for these will be taken from ei- ther or both of the main generators. Un- der one condition of, operation, both dredging pumps will be driven from one generator, the other generator furnishing power for propulsion. Under another condition of operation, when no propul- sion is required, each dredging pump will be connected to a main generator and will operate independently. The boat will measure 261 feet in length, with a beam of 43% feet and a draft, when loaded, of 18 feet. Included among the auxiliaries, besides the steering gear, will be three 10- horsepower pumps. The dredge will also be equipped with facilities for han- dling dry material. — i (uss LSRATHE EE I ETL ea FRESH WATER TANKS” a -FEED TANK yee] “FRAME 109 | a [\— |] ar} D4 Fi ae aH Tamil IRE, BILGE AND SANITARY PUMPS. WORKING PLATFORM AR BOTTLE ot oe COMBINED LUBRICATING OK AND CIRCULATING PUMPS Ce TRANSFER PUMP PLAN VIEW SHOWING POSITION OF MACHINERY IN ENGINE ROOM OF. MOTORSHIP SEEKONK