Hindley's screw

noun
Hind·​ley's screw | \ ˈhī|n(d)lēz-, ˈhi|\

Definition of Hindley's screw

: an endless screw or worm shaped like an hourglass to fit a part of the circumference of a worm wheel so as to increase the bearing area and thereby diminish the wear

called also hourglass screw

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History and Etymology for Hindley's screw

after Henry Hindley, 18th century English clockmaker

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