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" The pulley is a small wheel, movable about its axis by means of a cord, which passes over it. When the axis of a pulley is fixed, the pulley only changes the direction of the power ; if movable pulleys are used, an equilibrium is produced, when the power... "
A Compendium of Natural Philosophy: Adapted to the Use of the General Reader ... - Page 100
by Denison Olmsted - 1842 - 360 pages
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A Plain Elementary and Practical System of Natural Experimental Philosophy ...

John Ewing - Astronomy - 1809 - 672 pages
...threads of the screw, and these distances are proportional to their respective velocities. Therefore the power is to the weight, as the distance between two contiguous threads of the screw is to the circumference of the circle described by the power in one revolution. For they...
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Institutes of Natural Philosophy: Theoretical and Practical

William Enfield - Astronomy - 1811 - 476 pages
...as PA, half the breadth of the wedge, to PB its height SCHOL. I. Since in all the mechanical powers, an equilibrium is produced, when the power is to the weight as the velocity of the weight is to the velocity of the power, in all compound machines there will be an equilibrium,...
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Library of Useful Knowledge: Natural philosophy, Volume 1

Physics - 1829 - 522 pages
...equal to the weight or resistance, multiplied by the distance between two contiguous threads ;" or, " The power is to the weight, as the distance between two contiguous threads is to the circumference described by the power." It frequently happens, that the lever by which the power acts is attached...
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The Teacher's Assistant in the "Course of Mathematics Adapted to the Method ...

Mathematics - 1836 - 488 pages
...pivot itself being at the same time either fixed or movable. THE INCLINED PLANE. In an inclined plane, an equilibrium is produced, when the power is to the weight as the sine of the inclination of the plane is to the sine of the angle, which the direction of the power...
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An Introduction to Natural Philosophy: Designed as a Text Book ..., Volume 1

Denison Olmsted - Physics - 1838 - 376 pages
...continued in the Fig. 96. same manner. By Art. 131, when the power acts parallel to the base of the plane, an equilibrium is produced when the power is to the weight as the height of the plane to its base; or, applied to the screw, an equilibrium is produced, when the power...
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A manual for mechanics' institutions

Society for the diffusion of useful knowledge - 1839 - 380 pages
...The stones composing the arch of a large bridge are truncated wedges. THE SCREW. ' 39. In the screw, the power is to the weight as the distance between two contiguous threads to the circumference of the circle which the power describes. The screw may be considered as generated...
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The National Arithmetic, on the Inductive System: Combining the Analytic and ...

Benjamin Greenleaf - Arithmetic - 1839 - 356 pages
...pulley is fixed, the pulley only changes the direction of the power ; if movable pulleys are used, an equilibrium is produced, when the power is to the weight, as one to the number of ropes applied to them. If each movable pulley has its own rope, each pulley will...
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A New System of Arithmetic: In which is Explained and Applied to Practical ...

Calvin Tracy - Arithmetic - 1840 - 316 pages
...the weight to the axle, when an increase of action is to be gained. In the use of the wheel and axle, an equilibrium is produced, when the power is to the weight as the semi-diameter of the axle is to the semi-diameter of the wheel. Prob. 25. Given the diameter of the...
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A New System of Arithmetic: In which is Explained and Applied to Practical ...

Calvin Tracy - Arithmetic - 1840 - 326 pages
...which a gain in power is effected. A double movable pulley is represented at fig. 2. By such a pulley an equilibrium is produced, when the power is to the weight, as one to the number of ropes sustaining the weight. If a single movable pulley be employed, the weight...
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United States Calculator: Or, Arithmetic Simplified

John M'Nevin - Arithmetic - 1841 - 300 pages
...the pully is fixed, the pully only changes the direction of the power; if moveable pulleys are used an equilibrium is produced when the power is to the weight, as one to the number of ropes applied to them, if each moveable pully has its own rope, each pully will...
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