TABLE XII. DIMENSIONS OF DE LAVAL STEAM TCRBINES FROM 75 TO 300 H.P. De Laval steam turbines have been successfully employed in the lighting of trains on the Prussian State Railways. A De Laval non-condensing turbine is mounted on the same bedplate as an enclosed dynamo, and is secured on top of the boiler of the locomotive. Mains lead from the dynamo brushes along the length of the train, and are connected to a battery of accumulators in each car. Each glow lamp is provided with a resistance which limits the voltage between the lamp terminals to 48 volts. In some instances a 20 B.H.P turbine is used, and in this case the dynamo makes 2000 revolutions per minute. The steam consumption of the turbine has been stated to be in some cases from 42 to 44 lbs. per B.H.P. hour. (Non-condensing.) Plate VI. shows a 200 kilowatt two-phase turbo-alternator constructed by the American De Laval Steam Turbine Company. Plate VII. shows a 300 H.P. De Laval Turbine Dynamo, constructed by the American De Laval Turbine Company, and of somewhat different design to that shown in Plate V. Plate VIII. shows a 225 B.H.P. De Laval turbine constructed by Messrs. Greenwood & Batley, Ltd., and provided with pulleys for belt driving. One pulley, 19 inches in diameter and 17 inches wide, is arranged on each power shaft which rotates at 1000 revolutions per minute. This gives a belt speed of about 5000 feet per minute. The pulleys are arranged clear of each other lengthwise so that both can drive in the same direction. FIG. 135.-De Laval Turbine (Parallel) Centrifugal Pump. Fig. 135 shows a De Laval turbine centrifugal pump as supplied by the same firm. T is the turbine-wheel casing, surrounding which can be seen the wheels W for controlling the steam jets. G is the gear-wheel casing, emerging from |