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Windlass
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==Differential windlass== {{See also|Differential pulley}} [[File:Comparison_differential_pulley_windlass.svg|thumb|Comparison of a differential pulley, or chain hoist, at left, and a differential windlass, or Chinese windlass, at right. The rope of the windlass is depicted as spirals for clarity, but it is typically helices with axes perpendicular to the image.]] In a '''differential windlass''', also called a '''Chinese windlass''',<ref name="Chinese windlass OED">{{OED|Chinese}} {{Registration required}}</ref><ref name="Morris">{{citation |editor-last=Morris |editor-first=Christopher |year=1992 |title=Academic Press Dictionary of Science and Technology |publisher=Gulf Professional Publishing |isbn=978-0-12-200400-1 |page=416}}</ref><ref name="Knight">{{citation |last=Knight |first=Edward H. |year=1884 |title=The Practical Dictionary of Mechanics |publisher=[[Cassell, Petter, Galpin & Co]]}} "''Chinese-windlass'', a differential windlass in which the cord winds off one part of the barrel and on to the other."</ref> there are two coaxial drums of different radii ''r'' and ''rβ²''. The rope is wound onto one drum while it unwinds from the other, with a [[movable pulley]] hanging in the [[bight (knot)|bight]] between the drums. Since each turn of the crank raises the pulley and attached weight by only {{nowrap|{{pi}}(''r'' β ''rβ²'')}}, very large [[mechanical advantage]]s can be obtained.
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