Rapson's slide

noun

Rap·​son's slide

ˈrapsənz-

: a device that consists of a crosshead capable of moving in fixed guides and having a pivoted block with a hole in it through which passes a lever hinged at a fixed point outside and that is used as a differential gear for a ship's rudder

Word History

Etymology

after John Rapson, British millwright who patented such a device in 1834

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