. Farm implements, and the principles of their construction and use; an elementary and familiar treatise on mechanics, and on natural philosophy generally, as applied to the ordinary practices of agriculture ... great advan-tage. Hence its use in allrevolving straw-cutters,where the knives makequickly-repeated strokes(Fig. 5). More recentlyit has been applied to the Straw-cutter with fly-wheel. dasher - chum (Fig. 6), where the rapid upright strokesare so well known to be very fa-tiguing for the amount of forceapplied. By thus regulating motion,the fly-wheel frequently enablesan irregular forc
. Farm implements, and the principles of their construction and use; an elementary and familiar treatise on mechanics, and on natural philosophy generally, as applied to the ordinary practices of agriculture ... great advan-tage. Hence its use in allrevolving straw-cutters,where the knives makequickly-repeated strokes(Fig. 5). More recentlyit has been applied to the Straw-cutter with fly-wheel. dasher - chum (Fig. 6), where the rapid upright strokesare so well known to be very fa-tiguing for the amount of forceapplied. By thus regulating motion,the fly-wheel frequently enablesan irregular force to accomplishwork which otherwise it couldnot perform. Thus a man mayexert a force equal to raising ahundred pounds, yet, when heturns a crank, there is one partof the revolution where heworks to great disadvantage, and where his utmostforce will not balance forty pounds. Hence, if thework is heavy, he may not be able to turn the crank,nor to do any work at all. If, however, a fly-wheel beapplied, by gathering force at the most favorable partof the turning, it carries the crank through the otherpart. An error is sometimes committed by supposing thefly-wheel actually creates power, for as much force is. Churn with a equal-izing the motion. THE PLY-WHEEL. 29 required to give it momentum as it afterward impartsto the machine; it consequently only accumulates andregulates power. A curious example of the effect of momentum isshown in the failure and success of two different modesof constructing wire fences with very slender wires forthe boundaries of pastures. The unsuccessful modeconsisted of tightly-stretched wires between solid postsnot more than twelve to twenty feet apart. A sidestrain of only a few inches was enough to snap thewires; consequently, a bullock plunging blindly againstthem could not be quickly enough checked in his mo-mentum, and such fences were therefore nearly uselesswithout stronger wire. The successful mode was tostretch the wires well between
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Keywords: ., bookcentury1800, bookdecade1850, bookpublishernewyo, bookyear1854
