Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . Fig. 4. Lever 1st kind. To find the power (P) on any lever, ivhen the weight (W) andtwo distances from the fulcrum (b)are given. Sub-Rule 1. Multiply the weight (W) by its distance from the fulcrum(b) and divide by the distance from P, to b. The quotient is the power. Example. How much to balance 200 lbs., 18 inches from the fulcrum(b) to the end of the lever at (P). The whole length of thelever being 36 lbs. 36 in.)3600(100 lbs. Answer. The exMKiple gi
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . Fig. 4. Lever 1st kind. To find the power (P) on any lever, ivhen the weight (W) andtwo distances from the fulcrum (b)are given. Sub-Rule 1. Multiply the weight (W) by its distance from the fulcrum(b) and divide by the distance from P, to b. The quotient is the power. Example. How much to balance 200 lbs., 18 inches from the fulcrum(b) to the end of the lever at (P). The whole length of thelever being 36 lbs. 36 in.)3600(100 lbs. Answer. The exMKiple given to illustrate the general rule is similar tothis. 54 Hand Book of Calculations. THE Fig. 5. Lever of the 2d kind. To find the weight (W) when the power (P) and the two dis-tances from the fulcrum (b) are given. Sub-Rule 2. Multiply the power (P) by its distance from the fulcrum (b)and divide by the distance of the weight (W) from the quotient is the weight. Example. If 480 lbs. be applied at the end of a lever, 135 inches fromthe fulcrum, what weight will it lift 45 inches distance from thefulcrum. 480 Prooe. 135 ±440 x 45 = 64,800 480x135 = 64,800. 2400 1440 480 )64800(14 40 lbs. Ans. 45 198 180 180 fp>_ 180 Hand Book of Calculations. 55 THE LEVER.
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