Davies, Charles or Davis, Phineas
by Francis Moon & Daina Taimina
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Not clear wheather Davies spherical engine in Reuleaux collection is an invention of Charles Davies (?-?), 19th century American mathematics textbook author and promoter of the use of metric system inAmerican schools, or Phineas Davis (1797?-1835), American 'grasshoper' engine inventor.

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