Maritime History of the Great Lakes

Marine Review (Cleveland, OH), 28 Sep 1899, p. 45

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1899.] and deck winches will be operated by electricity. Each ship will carry one 30-foot steam cutter, one 30-foot launch, two 28-foot cutters, two 26- foot cutters, one 28-foot whaleboat gig, one 28-foot whaleboat, and one 18-foot dingey. The complement will 'be twenty-seven officers, 238 sea- men and twenty-five marines. ENGINES, BOILERS AND GENERAL MAGHINBERY EQUIPMENT. The propelling engines will be right and left, placed in watertight compartments, and separated by a middle-line bulkhead. These engines will be of the vertical, inverted-cylinder, direct-acting, triple expansion type, each with a high-pressure cylinder 18 inches, an intermediate-pres- MARINE REVIEW. ie of composition and steel. Each main condenser will have a cooling sur- face of about 3,000 square feet, measured on the outside of the tubes, the water passing through the tubes. For each propelling engine there will be a single-acting, vertical air pump, worked from the forward low-pres- sure crosshead. The main circulating pumps will be of the centrifugal type, one for each main condenser. Hach auxiliary condenser will have 400 square feet cooling surface, and it will have a combined air and circu- lating pump, and will be connected with all the auxiliary machinery. __ There will be six boilers of the water tube type placed in two water- tight compartments. The total grate surface will be at least 314 square feet, and the total heating surface about 12,600 square feet. Two blowers iS " + eee . 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The arrangement of cylinders, beginning for- ward, will be as follows: Forward low-pressure, high-pressure, interme- discharging into the forward and one discharging into the after boiler com- partment, will be fitted, the compartments being air tight. As shown by the drawings two smoke pipes will be used. There will be one main feed pump and one bilge pump in each boiler compartment, and there will be located in each engine compartment the following steam pumps: Auxil- iary feed, fire and bilge, water service, and hot well. There will also be a bilge pump for each engine, worked from a pin on the forward end of PLAN OF ENGINES OF NEW PROTECTED CRUISERS, U. S. NAVY, NOS. 14-19. diate-pressure, and a ter low-pressure. The forward low-pressure and high- Pressure cranks will be opposite, also the intermediate and after low- Pressure cranks, the second pair being at right angles with the first. The sequence of cranks will then be high-pressure, intermediate-pressure, for- ward low-pressure and after low-pressure. The main valves will be worked by Stephenson link motions with double-bar links. The valve gear of the our cylinders will be made interchangeable so far as is practicable. There will be one piston valve for each high-pressure cylinder and two for each Intermediate-pressure cylinder. Fach low-pressure cylinder will have a double-ported balanced slide valve. a The framing of the engines will consist of forged steel columns trussed by forged steel stays. The engine bed-plates will be of cast steel, sup- Ported on the keelson plates. Ali crank, line, and propeller shafting will be hollow. The shafts, piston rods, connecting rods, and working parts 8enerally will be forged of open-hearth steel. The condensers will be made the crank shaft. Propellers will be right and left. Auxiliaries otherwise will include steam reversing gear, with oil control cylinder, ash hoists, turning engines, auxiliary pumps, engines for workshop machinery, dis- tilling and evaporating apparatus, refrigerating machinery, and other es- sentials of modern equipment. PUMPS, EVAPORATORS, E'TC., FOR TWENTY VESSELS OF WAR. M. T. Davidson of Brooklyn, manufacturer of improved steam and hydraulic machinery, has just finished and delivered all the pumps, evapo- rators and distillers, and ash ejectors for the following naval vessels: Torpedo boat destroyers Decatur, Dale, Truxton, Whipple, Worden, 'Barney and Biddle; torpedo boats Blukely, DeLong, Nicholson, O'Brien, Shubrick, Stockton, Thornton and Tingey; monitors Arkansas, Connecti- cut and Florida; and transports Sedgwick and Meade.

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