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block and tackle |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.03 sec. |
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block and tackle: see pulley pulley, simple machine consisting of a wheel over which a rope, belt, chain, or cable runs.
A grooved pulley wheel like that used for ropes is called a sheave. ..... Click the link for more information. . block and tackleCombination of pulleys with a rope or cable, commonly used to augment pulling force. Two or more of the pulleys are attached to a fixed block, and the remaining pulleys are free to move as well as rotate. A block and tackle can be used to lift heavy weights or to exert large forces in any direction. Higher force ratios may be obtained by the use of more pulleys, but this advantage may be offset by increased friction. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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They divided it into cakes by methods too well known to require description, and these, being sledded to the shore, were rapidly hauled off on to an ice platform, and raised by grappling irons and block and tackle, worked by horses, on to a stack, as surely as so many barrels of flour, and there placed evenly side by side, and row upon row, as if they formed the solid base of an obelisk designed to pierce the clouds. |
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block and tackle