. A manual of marine engineering: comprising the design, construction, and working of marine machinery. icular method, ofcourse, depends on the factthat the bob weights haveno resolved part horizon-tally. 11. To Balance anEngine of any number ofCranks. — As the methodof solving this problem isthe same in principle ashas just been described inpars. 9 and 10, the casewill be most easily ex-plained by means of anexample. In the example theengine will be balancedboth vertically and hori-zontally, and the combinedsystem of bob and rotatingweights must, therefore,be used. Should, how-ever, the desig
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. icular method, ofcourse, depends on the factthat the bob weights haveno resolved part horizon-tally. 11. To Balance anEngine of any number ofCranks. — As the methodof solving this problem isthe same in principle ashas just been described inpars. 9 and 10, the casewill be most easily ex-plained by means of anexample. In the example theengine will be balancedboth vertically and hori-zontally, and the combinedsystem of bob and rotatingweights must, therefore,be used. Should, how-ever, the designer of anyparticular engine decidethat he cannot very welladopt the most completemethod, he will understand from the previous paragraphs what sacrificeswill have to be made if only one kind of balancing device is methods of construction are precisely the same, although moreextensive. The example (fig. 214) is a three-cylinder engine with ordinary linkmotion for each valve. Two bob weights will be fitted, one at each endof the engine, and four balance weights, one on each crank web of the. 912 1Fig. 213. BALANCING. 557 outside engines. It will also be decided to balance half the rotating massesby the H P and L P forward weights, and half by the H P and L P afterweights.
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