A textbook on the locomotive and the air brake (1901) (14756613084)

Identifier: textbookonlocomo02inte (find matches)
Title: A textbook on the locomotive and the air brake
Year: 1901 (1900s)
Authors: International Correspondence Schools
Subjects: Locomotives Locomotive boilers Locomotives Railroad cars
Publisher: Scranton, Pa., International textbook co
Contributing Library: Northeastern University, Snell Library
Digitizing Sponsor: Northeastern University, Snell Library



Text Appearing Before Image:
area for each succeeding expansion of thesteam, as do all compound engines, it also provides a decreasingpiston velocity, as the pressure of the steam is decreased byeach successive expansion, the speed of the last pistons beingequal to but 55 per cent, of the speed of the pistons againstwhich the steam is first used. In Fig. 1 is shoAvn a vertical section, cut lengthwise throughthe machine, from which a very good idea of the constructionand relative positions of the parts can be gained. The turbinewheel on the right, marked 2, is fastened solidly to the mainshaft S and contains four sets of buckets. The outer set a is atits extreme outer diameter, while the three remaining sets ofbuckets, marked 5, c, and d, respectively, also in circular form,are inside the outer row. Each row of buckets, beginning withthe row a, has a gradually decreasing speed, the peripheralspeed of the last row d being but 4,000 feet per minute against7,200 feet per minute, the speed of the outer row. The steam
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THE ELECTRIC HEADLIGHT. 14 entering at A passes through two ports / in the governorstand So, strikes the face of the first row a of buckets, and asthe wheel moves forward, it allows the steam to exhaust or passout through the bottomless buckets into a series of stationaryexhaust passages h, the direction of travel of the steam beingin a measure reversed. These exhaust passages are so shapedas to change the movement of the steam in a forward directionagain, and discharge it into the second row b of buckets, which,like the low-pressme cylinders of a compound locomotive, areof greater capacity than the first, and, in addition, are movingslower because of their decreased distance from the shaft S.A second force is thus exerted on the wheel. The steamexhausts from this second row of buckets into a second seriesof exhaust passages i, which causes it to impinge against thethird row c of buckets. Exhausting again into a third seriesof exhaust jDassages j, it is directed against the fourth row