Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . ar, Showing Gears when Side of Casing is Removed. 35° THE STEAM TURBINE _ i yf9 B^» - if \$ Eg? « BB». ?*»—X JH L |\ L^Z^f • vV 1 v MB 1 * jj» 1 m ^ iu *J 1 Fig. 185k. Reduction Gear, Showing Flexible Support of Pinion. 22a 20 N 1204 KNO T8 0Si 18 S V J? 16 > «>. V ^ «»» 0 14 P40 1 12 110 1 86 12-24 knq; S» -<2l 19-21 CN01 S. 21 JS KNO- 6 - 19-21 fNOl s 21-6 UN nrs 2000 6000 10000 14000 18000 22000 26000 30000Horsepower. Fig. 185I. Water Rate Curves of U. S. Bat
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . ar, Showing Gears when Side of Casing is Removed. 35° THE STEAM TURBINE _ i yf9 B^» - if \$ Eg? « BB». ?*»—X JH L |\ L^Z^f • vV 1 v MB 1 * jj» 1 m ^ iu *J 1 Fig. 185k. Reduction Gear, Showing Flexible Support of Pinion. 22a 20 N 1204 KNO T8 0Si 18 S V J? 16 > «>. V ^ «»» 0 14 P40 1 12 110 1 86 12-24 knq; S» -<2l 19-21 CN01 S. 21 JS KNO- 6 - 19-21 fNOl s 21-6 UN nrs 2000 6000 10000 14000 18000 22000 26000 30000Horsepower. Fig. 185I. Water Rate Curves of U. S. Battleships and Computed Curves ifGeared Steam Turbines were used. MARINE TURBINES 351 shaft horsepower per hour of the engines in the two battleships,while C and Ci show the corresponding results if geared turbineshad been used instead of reciprocating engines. It is estimatedthat with a geared turbine combination of the Westinghouse floating frame type the economy of the prime movers invessels of the Delaware class could be improved 30 per cent,at full speed and 25 per cent, at cruising speed. Fig. 185m. FlG. 185m. Low-pressure Turbine Casing for German Steamship. shows the enormous size of the casings for the low-pressuresections of the steam turbines installed in modern battle-ships. Electrical Transmission for Ships. Another method differ-ent from the use of reduction gears has been frequently sug-gested for making the steam turbine more adaptable for marineservice. This method consists in using on the vessel steamturbines direct connected to high-speed electric generators,which can operate then under practically identical conditionsas in land service. These turbines, obviously, can then bedesigned to operate at a speed best suited to obtain high effi-ciency. The electric current from the generators is used slow-speed electric motors on the shafts of the propellers,the speed here being that giving best efficiency for the pro-pellers. This method offers
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