Rapson's slide

noun Rap·son's slide \ˈrapsənz-\

Definition of Rapson's slide

  1. :  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

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Origin and Etymology of rapson's slide

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


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