Machinists' and draftsmen's handbook, containing tables, rules and formulas, with numerous examples explaining the principles of mathematics and mechanics as applied to the mechanical trades; intended as a reference book for all interested in mechanical work (1910)
Lobben, Peder, 1858- · New York, D. Van Nostrand company · leaf 342
by a machine by the energyput into the same machine ; multiply the quotient by 100, anclthe result is the per cent, of efficiency of the machine. Example. A dynamo requires 15 horse-power, but the electrical powergiven out is only 12 horse-power. What is the efficiency?Solution: Efficiency = — X… … Crane hooks, as shown in Figs. 1, 2 and 3. may be designedby the following formulas : P=B2 D^s/F P = Load in tons.D = Diameter of iron in inches. e=±y2D f=2B g=l%D i—\% D j=7/zD t=%D i = yAD m = iy2D k = iysL> S = Standard screw of diameter r n at the bottom of the thread. When a rectangular…
Mechanical engineering
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