. American engineer and railroad journal . aight. found that instead of a rapid falling off in power, thataccompanies increase of speed in ordinary simple engines, thechange in the steam distribution in this four-cylinder com- 100 go 00 70 eo so 40 iO zo ? Mf;cy lirdii:^. 1 - - — . ^ _ ^ M m--iWr Per Cent Piston O/splacement J 1 1 ^ H. RCylirifler- > ^ ? ■^ ^ — —1 ■ / y ,. - J y -< s inc. \lei ^upan^ioh // z i^- ■r u ^ §^ It loo 90 eo 70 SO SO 40 30 so P oPer Cent P/sivr? O/sp/acement Fig. 1. pound gave increased horse power and increased economy up to270 revolutions per minut
. American engineer and railroad journal . aight. found that instead of a rapid falling off in power, thataccompanies increase of speed in ordinary simple engines, thechange in the steam distribution in this four-cylinder com- 100 go 00 70 eo so 40 iO zo ? Mf;cy lirdii:^. 1 - - — . ^ _ ^ M m--iWr Per Cent Piston O/splacement J 1 1 ^ H. RCylirifler- > ^ ? ■^ ^ — —1 ■ / y ,. - J y -< s inc. \lei ^upan^ioh // z i^- ■r u ^ §^ It loo 90 eo 70 SO SO 40 30 so P oPer Cent P/sivr? O/sp/acement Fig. 1. pound gave increased horse power and increased economy up to270 revolutions per minute, the limit of the tests, and the slopeof the horse power line tended to show that the power con-tinued to increase for much higher speeds. Whereas the simplelaboratory locomotive gave curved lines, showing that thepower reached its maximum at about 240 revolutions per min-ute, and then fell rapidly away. Mr. Vauclain has added testimony from data taken from. 160 200 wo £80 Petv/i/fibm per M/ 2. the engine of the Atlantic City Flyer (American Engineer,December, 1897, page 326, and October, 1898, page 341), andthe Atlantic type engines of the Chicago, Milwaukee & (American Engineer, August, 1896, page 170). He pre-sented diagrams, Fig. 1, of the port openings of this type ofcompounds compared with simple engines, and attributed theadvantage of the compound over (he simple engine to thevalve motion, and the fact that the steam and exhaust ports ofthis compound remain open longer than those of the simpleengine. The effect of this appears in the absence of back pres-sure and wire drawing in comparative indicator cards, andthe difference between the cards from the compound andsimple engines is remarkable. The diagram of the horse powerOf the Atlantic City engine, above 220 revolutions per minute, Februaky, 1890, AMERICAN ENGINEER AND RAILROAD JOURNAL 63 becomes a straight line similar to those secured by They
Size: 1364px × 1831px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
