“All screws of a given pitch belonging to a system of the third order are the generators of a certain hyperboloid. There is… a different hyperboloid for each pitch. …all these hyperboloids are concentric.”

—  Robert Stawell Ball

A Treatise on the Theory of Screws https://books.google.com/books?id=ECZ-MkhTdvkC 1900 p. 173

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Robert Stawell Ball photo
Robert Stawell Ball6
Irish astronomer 1840–1913

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