A hand book of general instruction for mechanics, containing useful rules and memoranda for practical men (1907)
Smith, Franklin Elijah, 1872- · New York, D. Van Nostrand company · leaf 302
small space. Noaccurate estimate can be made of the work done bywedges as they are ordinarily used, but calculations workedout according to the following rules will give an approx-imate idea of the amount of work which may be performedby them. THE SIMPLE MACHINES 289 To Find the Power Rule.… … Fig. 101 200 X 3 ~~20 60020 30 lb. pressure Example. If a wedge 12 inches long and 3 inchesthick is employed to raise a weight of 1000 pounds, whatpressure must be exerted? P = 1000 X 3 3000 12 12 = 250 lb. Arts. To Find the Weight Rule. Multiply the power by the length of thewedge and divide by…
Mechanics · Arithmetic · Measurement
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