This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ...as is usual, the vertical impulses may become serious at high speed: This "hammer-blow," struck on the rail at each revolution of a driving-wheel, in consequence of the action of the added mass, becomes more serious as the weights and speeds of reciprocating parts increase. The Voolf type of compound has the special ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ...as is usual, the vertical impulses may become serious at high speed: This "hammer-blow," struck on the rail at each revolution of a driving-wheel, in consequence of the action of the added mass, becomes more serious as the weights and speeds of reciprocating parts increase. The Voolf type of compound has the special advantage, at Fig. 185.--Thkke-cvlinder Engine And Dynamo. high speeds and with direct connection, of permitting a very thorough balance, with its resulting gain in reduced friction of crank-shaft and smoothness of operation. This fact is well illustrated by the compound engine, designed by Mr. Wells, shown in Fig. 184. Here the weight of running parts is made the same for both engines; the cranks are set opposite, and the balance is practically complete. The work in the two cylinders is also made nearly the same in regular working at Vienna Report: R. II. Thurston; 1873. speed, and the resultant effect is, when these conditions are satisfied, very satisfactory in this respect. The deduction thus secured in the stresses produced on the frame is worthy of consideration, and the wear of main journals and boxes, in consequence of their relief from load, is likely to prove much less and their life greater. Quadruple-expansion engines are readily arranged on this principle; although they have no important advantage, in this respect, over the usual three-crank engine. The Brotherhood type of engine, characterized by its equidistant cylinders--three or four--arranged to connect with a common crank and pin, is an example of complete balancing, and can be driven, like all such engines, up to enormously high speeds. The Author has known them to be carried, experimentally, up to above 2500 revolutions per minute, and 1000 revolutions has been fre...
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