Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . 64 Hand Book of Calculations. THE PULLEY. Fast and loose pullies. These are shownin Fig. 12 where the movable block A car-ries the weight with a fixed counterpartB. Here the rope is attached by one endto the fixed block and is passed over themovable and fixed pullies from one to theother in succession, the power being ap-plied to the other end. This system isknown as fast and loose pulley blocks. The fixed end of the rope is sometimesfastened to the movable block. To fi
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . 64 Hand Book of Calculations. THE PULLEY. Fast and loose pullies. These are shownin Fig. 12 where the movable block A car-ries the weight with a fixed counterpartB. Here the rope is attached by one endto the fixed block and is passed over themovable and fixed pullies from one to theother in succession, the power being ap-plied to the other end. This system isknown as fast and loose pulley blocks. The fixed end of the rope is sometimesfastened to the movable block. To find the power necessary to balancethe weight by the means of a system offast and loose pulleys. EtJLE 1. Divide the weight by the number ofropes by which it is carried; that is byFig. 12. the number of ropes which proceed from the movable block. The quotient is the power required to bal-ance the weight. cylinder cover weighing 1200 lbs. is lifted by a pair ofblocks of two sheaves each, the rope is fastened to the , then, in two sheaves there are 4 )1200. 300 lbs. will balance the weight of the cylinderhead. boiler weighing 6 tons has to be lifted by a pair of trebleblocks; how much power must be applied at the end of therope to balance the weight. 6 tons2000 6)12000 lbs. 2000 lbs. Hand Book of Calculations. 65
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