. Electrical news and engineering . 14,500,000 passen-gers, which, contrasted with 57,000,000 carried by theelectric railways, shows that four times as many passen-gers were carried bj electricity as by steam, and that,on an average, every person in Canada had been carriedJI times in the year by electricity. May, 1896 CAHflDlAfJ EbECTRICAli JMEWS 87 TESTS OF A JO HORSE-POWER DE LAVAL STEAM TURBINE. i;v WM. 1. M. i;.vN. The De Laval steam turbine experimented upon constitutespart of the permanent equipment of the Engineering Laboratoryof Purdue University, and the present paper is based upon da
. Electrical news and engineering . 14,500,000 passen-gers, which, contrasted with 57,000,000 carried by theelectric railways, shows that four times as many passen-gers were carried bj electricity as by steam, and that,on an average, every person in Canada had been carriedJI times in the year by electricity. May, 1896 CAHflDlAfJ EbECTRICAli JMEWS 87 TESTS OF A JO HORSE-POWER DE LAVAL STEAM TURBINE. i;v WM. 1. M. i;.vN. The De Laval steam turbine experimented upon constitutespart of the permanent equipment of the Engineering Laboratoryof Purdue University, and the present paper is based upon datasecured chiefly through the assistance of Charles E. Bruff, ,author of the thesis Tests of a 10 Horse-Power De SteamTurbine. In the De Laval steam turbine jets of steam, delivered fromsuitable nozzles, are made to impinge against the buckets of alight turbine wheel. The steam enters the buckets from one sideof the wheel, and passing through is discharged or ex-hausted from the opposite side. The arrangement of nozzle. Fig. I. and wheel is shown in Fig i. The motion of the turbine shaft,which under the actions of the jets is extremely rapid, is com-municated by gearing to a heavier and slower-moving drivingshaft carrying a fly-wheel of small diameter, from which thepower of the engine is delivered. Regulation of speed is securedby means of a throttling governor, which controls the pressure ofsteam admitted to the nozzles. The important moving parts, with approximate dimensions, areshown in Fig. 2. The turbine wheel is built of sixty-three steelsegments, each carrying a bucket and a portion of the light out-side rim. The segments are held in place by means of suitablecollars, which grip them on either side. The wheel is mountedupon a long, slender shaft, having sufficient flexibility to allowthe system at speed to revolve about its centre of gravity, eventhough this may not agree with the geometrical axis of the gear upon the turbine shaft is of steel, so
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