At Liege (September 1633), with the words " although he professes that the [Copernican] theory was only adopted by him as a hypothesis."
3 The Copernican theory is rejected in name, but retained in substance.
But it is a plain finding of history that he has brought no " Copernican revolution " 4 to their minds.
As results of Roberval's labours outside the department of pure mathematics may be noted a work on the system of the universe, in which he supports the Copernican system and attributes a mutual attraction to all particles of matter; and also the invention of a special kind of balance which goes by his name.
But his assent to this was only extracted from him in 1540 by the importunities of his friends, especially of his enthusiastic disciple George Joachim Rheticus (1514-1576), who printed, in the Narratio prima (Danzig, 1540), a preliminary account of the Copernican theory, and simultaneously sent to the press at Nuremberg his master's complete exposition of it in the treatise entitled De revolutionibus orbium coelestium (1543).
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