Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . 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
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . 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 Z3 Fig. 6. Lever of the 3rd kind. To find the distance of the poiver (P) from the fulcrum (b)the weight and its distance and the power being given. Sub-Rule 3. Multiply the weight (W) by its distance from the fulcrumtad divide by the power. Example. If a weight 900 lbs. be 12 inches from the fulcrum, at what^stance must 80 lbs. be placed to balance it ? 12 Proof. 900 900 12 10,800. 135 80 10,800. 80)10800(135 inches 280240 400 To find the distance of the weight from the fulcrum. Thepower and its distance from the fulcrum and toeight beingknown. Sub-Rule 4. Multiply the power by its distance from the fulcrum anddivide by the weight. $6 Hand Book of Calculations. THE LEVER. Example. (Lever 3d kind.) If the power be 1,000 lbs., 3 inches fromthe fulcrum, at what distance must the weight (W) 120 lbs. beplaced to balance it. 1,000 lbs. power. Proof. 3 in. distance. 1,000 3 = 3,000. 120 25 = 3,000. 120)3000 25 inches. Ans. 25 inches from the fulcrum. The Leverage of the Power. The rat
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