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differential windlass

noun
  1. a pair of hoisting drums of different diameter turning at the same rate, such that a pulley suspended below them on a line wound on the larger drum and unwound from the smaller drum is raised with mechanical advantage.
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Also called Chinese windlass.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for differential windlass

differential windlass

noun
  1. a windlass employing the velocity ratio incurred in unwinding from a small drum while winding onto a larger drum rotating at a common speedAlso called: Chinese windlass
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012