 | Joseph Denison - 1841 - 210 páginas
...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,... | |
 | John E. Fuller - 1846 - 82 páginas
...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.,... | |
 | Septimus Norris - 1852 - 356 páginas
...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... | |
 | Frederick Augustus Griffiths - 1854 - 406 páginas
...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.,... | |
 | Charles Haslett - 1855 - 544 páginas
...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... | |
 | Charles W. Hackley - 1856 - 530 páginas
...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... | |
 | Charles Haslett, Charles William Hackley - 1859 - 574 páginas
...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... | |
 | Frederick Augustus Griffiths - 1859 - 426 páginas
...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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... 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... 