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" ... The movable pulley changes its position with that of the weight, and effects a saving equal to half the power. An equilibrium is preserved between the power and weight, when the weight is equal to the product of the power and twice the number of movable... "
A new treatise on mechanics, by the author of A new introduction to the ... - Page 143
by Joseph Denison - 1841 - 184 pages
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A new treatise on mechanics, by the author of A new introduction to the ...

Joseph Denison - Mechanics - 1841 - 210 pages
...equals by 2w, finding the power requisite to sustain any given weight by block-pulleys. Rule.—Divide the weight to be raised plus the weight of the lower...ton weight ? By theorem 1, (Single Moveable Pulley}, w 20 cwt. . P — -jj := —^— =10 cwt. or £ ton ; the answer. 2. With four moveable pulleys combined,...
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Improvement to Palmer's Endless Self-computing Scale and Key: Adapting it to ...

John E. Fuller - Ready-reckoners - 1846 - 82 pages
...10 ft. ; by 12 inches. = 300 Ibs. 20 inches. [Ans. PULLEY. RULE. — Divide the weight to be raised by twice the number of pulleys in the lower block ; the quotient will give the power necessary to raise the weight. EXAMPLE. — What power is required to raise 600 Ibs.,...
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Norris's Hand-book for Locomotive Engineers and Machinists

Septimus Norris - Locomotives - 1852 - 356 pages
...Ibs- x 10 feet x 12 inches 2Q inches- - = 300 Ibs-, Ans* PULLEYRULE — Divide the weight to be raised by twice the number of pulleys in the lower block ; the quotient will give the power necessary to raise the weightEXAMPLE — What power is required to raise 600 Ibs-, when...
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The Artillerists̓ Manual, and British Soldiers̓ Compendium

Frederick Augustus Griffiths - Artillery drill and tactics - 1854 - 406 pages
...and it should enter easily into the grooves of the sheaves. Rule. — Divide the weight to be raised by twice the number of pulleys in the lower block ; the quotient will give the power necessary to raise the weight. Example. — What power is required to raise 600 Ib.,...
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The Mechanic's, Machinist's, and Engineer's Practical Book of Reference ...

Charles Haslett - 1855 - 544 pages
...product of the power and twice the number of movable pulleys. RULE. Divide the weight to be raised by twice the number of pulleys in the lower block ; the quotient will give the power necessary to raise the weight. EXAMPLE. Required the power to raise 600 Ibs. when the...
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Mechanics and Engineers Book of Reference and Engineers Field Book

Charles W. Hackley - Engineering - 1856 - 530 pages
...product of the power and twice the number of movable pulleys. RULE. Divide the weight to be raised by twice the number of pulleys in the lower block; the quotient will give the power necessary to raise the weight. ''. EXAMPLE. Required the power to raise 600 Ibs. when...
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The Mechanic's, Machinist's, and Engineer's Practical Book of Reference

Charles Haslett, Charles William Hackley - Engineering - 1859 - 574 pages
...product of the power and twice the number of movable pulleys. RULE. Divide the weight to be raised by twice the number of pulleys in the lower block ; the quotient will give the power necessary to raise the weight. EXAMPLE. Required the power to raise 600 Ibs. when the...
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The Artillerists̓ Manual, and British Soldiers̓ Compendium

Frederick Augustus Griffiths - Artillery - 1859 - 426 pages
...and it should enter easily into the grooves of the sheaves. Rule. — Divide the weight to be raised by twice the number of pulleys in the lower block ; the quotient will give the power necessary to raise the weight. Example. — What power is required to raise 600 lb.,...
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