. The railroad and engineering journal . ciprocating parts at the beginning of the for-ward stroke. Question 421. IVhat effect do the counterweights have on thetrack? * The of the connecting-rod causes the counterbalance to movesomewhat slower than the jiiston while the crank-pins arc in front of theiraxles nr during the front half of their re\olution, and faster during the backlialf, as was explained in answer to Question 142. Vol. LXII. No. 9.] ENGINEERING JOURNAL. 42s Answer. If the whole of the revolving and reciprocatingparts are counterbalanced, the centrifugal force due to t
. The railroad and engineering journal . ciprocating parts at the beginning of the for-ward stroke. Question 421. IVhat effect do the counterweights have on thetrack? * The of the connecting-rod causes the counterbalance to movesomewhat slower than the jiiston while the crank-pins arc in front of theiraxles nr during the front half of their re\olution, and faster during the backlialf, as was explained in answer to Question 142. Vol. LXII. No. 9.] ENGINEERING JOURNAL. 42s Answer. If the whole of the revolving and reciprocatingparts are counterbalanced, the centrifugal force due to thecounterweights of the reciprocating parts acts alternately upwardand downward during each revolution of the wheels. Thus, ifa driving-wheel 5 ft. in diameter is loaded with a weight of $171,103 000, an increase of $28,603,000, as compared with1886. Limestone, used as in the manufacture of pig ironin 1S87, about 5,377,000 long tons ; value at quarry, about§3,226,200. Copper.—Total production, 184,670,524 lbs., of which 3,750,-. Fig. 262. Fig. 261. 14,000 lbs. at a speed of 50 miles under the conditions assumedabove, its pressure downward, when in the position shown infig. 259, would be : 14,000 — 7,330 — 6,670 lbs., and in the position shown in fig. 261, 14,000 + = 21,330 lbs. At the dead points shown in figs. 260 and 262, the centrifugalforces act horizontally, and therefore have no influences eitherupward or downward. In moving from the position shown infig. 259 to that shown in fig. 260, the upward pressure due tothe centrifugal force gradually diminishes, and when the crankreaches the dead point this force is horizontally, and pro-duces no upward or downward pressure. In passing from thedead point to the position shown in fig. 261, the centrifugalforce gradually increases in a downward direction until itreaches the position shown in fig. 261, and it then begins todiminish until it reaches the other dead point shown in fig. should be unders
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