WordReference Random House Unabridged Dictionary of American English © 2026
dif′feren′tial wind′lass, 
  1. Mechanical Engineeringa 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. Also called Chinese windlass. 

'differential windlass' also found in these entries (note: many are not synonyms or translations):
Chinese windlass

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