Roberval's balance

noun

Ro·​ber·​val's balance

ˈrōbə(r)ˌvȯlz-

: a balance in which the pans are fixed to the prolonged vertical sides of a jointed parallelogram whose two other sides are pivoted in their midpoints to a vertical post

Word History

Etymology

after Gilles Personne de Roberval †1675 French mathematician

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