Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . other than a straightpull altera the mechanical efficiency. 66 Hand Book of THE PULLEY. The single fixed pulley as shown inFig. 10 acts like a lever of the first hind,and simply changes the direction of theforces without modifying the intensity ofthe power. But the pulley may be employed as alever of the second hind by suspendingthe weight to the axis of the pulley, andfixing one end of the cord to a spot as afulcrum point X as shown in Fig. the p
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . other than a straightpull altera the mechanical efficiency. 66 Hand Book of THE PULLEY. The single fixed pulley as shown inFig. 10 acts like a lever of the first hind,and simply changes the direction of theforces without modifying the intensity ofthe power. But the pulley may be employed as alever of the second hind by suspendingthe weight to the axis of the pulley, andfixing one end of the cord to a spot as afulcrum point X as shown in Fig. the power acts through the diam-eter, A C B, in which B is the fulcrum. In acting as a lever of the third hind,the power is applied to the axis a inFig. 15, one end of the cord being fixedat h and the weight attached to theother end, c. In the last example the gain is -|.
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