Hindley's screw

noun

Hind·​ley's screw

ˈhī|n(d)lēz-,

ˈhi|

: 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

Word History

Etymology

after Henry Hindley, 18th century English clockmaker

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