This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ... and deflection. E = Compression or extension of one coil in inches. D = Diameter of coil in inches from centre to centre. d = Diameter or side of square of steel composing spring in-jtha of an inch. W = Weight applied in lbs. c = a constant found by experiment, which may be taken as 22 for round steel and 30 for ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ... and deflection. E = Compression or extension of one coil in inches. D = Diameter of coil in inches from centre to centre. d = Diameter or side of square of steel composing spring in-jtha of an inch. W = Weight applied in lbs. c = a constant found by experiment, which may be taken as 22 for round steel and 30 for square steel. E--D3W dc' 147. Spiral Springs, Eankine's Formula. diameter of wire in inches. coefficient of transverse elasticity of wire say 10,500,000 to 12,000,000 for charcoal iron wire, and steel, radius to centre of wire in coil, effective number of coils, greatest safe shearing stress, say 30,000. any load not exceeding greatest safe load. v = corresponding extension or compression. W = greatest safe steady load. ' = greatest safe steady extension or compression. W-jr-= greatest safe sudden load. W _ cdl w_-196/d3 e, _ 12566m/v v 64 m rJ r c d W Eatio--should be ascertained by direct experiment.--Bankine's Machinery and Millwork. 148. Differential Pulley Calculations. D: ..W-P. P-W X (Dd). 2" " 2D M = modulus or efficiency of machine, then W X M = actual load lifted. By experiment--Five cwt. differential pulley block multiplying 16 to 1, coefficient =-4. 30 cwt. differential pulley block multiplying 53 to 1, coefficient =-25. Note.--Load will not lower by itself when M is less than-5. PAET IV. THE STEAM ENGINE. 149. Hobse-power. Actual H.P. = 33,000 foot-lbs. per minute in all calculations, but the actual work of a horse is about 22,000 foot-lbs. per minute. Nominal H.P. low-pressure engine (pressure 7 lbs. above atmosphere) = d in inches! x V stroke in feet-r 47. Nominal H.P. high-pressure engine (pressure 21 lbs. above atmosphere), = N.H.P. low pressure engine X 3. Do. Watt's rule for condensing engines, = ds-i-28 (22 square ...
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