. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . e at Pawtucket, R J.—This engine, built in 1818 was described in Vol. II. of this work. Numerous tests of its working have shown that it has uniformly given a remarkably high record of economy. It is a horizontal cross compound en- ° gine, steam-cylmders, 15 and 30^ in. bore ;water cylinders, 10-52in.; stroke of all pis-tons, 30 in.; clear-ance, high-pressurecylinder, 4 per cent.;low, 3*7 per of rods,
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . e at Pawtucket, R J.—This engine, built in 1818 was described in Vol. II. of this work. Numerous tests of its working have shown that it has uniformly given a remarkably high record of economy. It is a horizontal cross compound en- ° gine, steam-cylmders, 15 and 30^ in. bore ;water cylinders, 10-52in.; stroke of all pis-tons, 30 in.; clear-ance, high-pressurecylinder, 4 per cent.;low, 3*7 per of rods, 2|in. Katio of vol-umes of cylinders,4085. Average cut-off in high-pressurecylinders, one-fourth,and in low, envelop thebarrels, but not theheads, of both cylin-ders, and steam offull boiler pressure isused in each Theheads are not jack-eted, but containpassages leading toand from the condensed steamfrom the jackets ispumped into the feedpipe at a point be-tween the boiler andhot well. The con-densed steam col-lected in the receiveris received in a trap,and continuouslypumped through aheater placed in thechimney flue, andthence returned to the. Fig. 4.^The Allis compound pumping-engine. 686 PUMPS, RECIPEOCATING. ffprntj *b»»A»* top of the receiver. Out of a total of about 155 lbs. thus circulated per hour, in actualwork, one-third only is evaporated and returned to the receiver as steam; the other two-thirdsgradually accumulates in the receiver and is blown to waste every three hours. In June, 1889, a test of this engine was made by Prof. James E. Denton, who says con-cerning it : The boiler evaporates 8*88 lbs. of water from 104° F. into steam of 127 with anthracite coalyielding 14 per cent, of ashes at 5lbs. rate of combustion, and 9-35lbs. of water from 104° F. withGeorges Creek bituminous coalyielding 10 per cent, of ashes at 5lbs. rate of combustion. The en-gine performs a horse-power ofwork in its steam-cylinders witha cons
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
