Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . nches. 36)672(18f36 lbs. X 6 inches = X 36 = 672. 312 288 24 9. 36 That is, 18f lbs. applied at the end of a 3 J foot bar with afulcrum 6 inches from the point, will lift a box weighing 112lbs. Example. If 80 lbs. be applied at the extreme end of a 5 foot lever (withprop 1 foot from the point), what force is needed to balance the80 lbs. The two leverages being 48 inches and 12 inches. Now, multiply the force (P) 80 lbs., by the distance fromthe fulcrum
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . nches. 36)672(18f36 lbs. X 6 inches = X 36 = 672. 312 288 24 9. 36 That is, 18f lbs. applied at the end of a 3 J foot bar with afulcrum 6 inches from the point, will lift a box weighing 112lbs. Example. If 80 lbs. be applied at the extreme end of a 5 foot lever (withprop 1 foot from the point), what force is needed to balance the80 lbs. The two leverages being 48 inches and 12 inches. Now, multiply the force (P) 80 lbs., by the distance fromthe fulcrum (F) 48 inches and divide by 12 inches. 48 inches. lbs. 48x80 lbs. =3840 12X320 =3840 12 in.)3840 320 is an example worked from the lever of the second kind. Hand Book of Calculations, 53 THE LEVER. Under the general rule given, it will be seen that under allcircumstances the force multiplied by its distance from the ful-crum, is equal to—or balanced by, the weight multiplied by itsdistance from the fulcrum; 4 sub-rules are added which willcover all problems where only three of the numbers are 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 LEVER.
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