Gilles de Roberval
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Gilles Personne de Roberval, French mathematician, was born at Roberval near Beauvais, France. His name was originally Gilles Personne or Gilles Personier, with Roberval the place of his birth.
Roberval balance
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The Roberval balance is a weighing scale presented to the French Academy of Sciences by the French mathematician Gilles Personne de Roberval in 1669.
A Roberval balance made by W & T Avery Ltd. in England
Detail: the bottom horizontal beam is hidden under the protective cover