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**HUYGENS, CHRISTIAN**
Horologium Oscillatorium

FIRST EDITION of Huygens's masterpiece; an outstanding copy with noted provenance."A work of the highest genius which has influenced every science through its mastery of the principles of dynamics. It is second in scientific importance perhaps only to Newton's Principia, which is in some respects based on it" (Singer, A Short History of Science to the Nineteenth Century)."Important as Huygens's clock was from both a practical and a scientific point of view (it could be used by astronomers), the Horologium ('The Oscillating Clock') is a general work on dynamics and especially a mathematical analysis of pendulum motion. It was the most original work of this kind since Galileo's Discorsi" (PMM 154)."Although others had suggested the pendulum as part of a timing mechanism, it remained for Huygens to apply his keen mathematical sense to the problems of the clock. In this work, of which the first and fifth books are devoted to the pendulum, he treated many problems of dynamics of bodies in motion. He determined the tautochronous character of the cycloid and applied it to invent an isochronous pendulum clock. To the theory of curves he added the theory of evolutes, the fall of bodies along curves, and determined the first value of the force of gravity by using a compound pendulum. At the end are listed 13 theorems that relate to the theory of centrifugal force in circular motion, a theory that aided Newton in determining universal gravitation" (Dibner 145). Provenance: Eprit Flechier (1632-1710), Bishop of Nimes from 1687 to 1710, and well-known for his published sermons and histories. Indentified by The Catholic Encyclopedia as "one of the greatest sacred orators of his century". His library was sold in London on January 25, 1726.Horologium Oscillatorium. Sive de Motu Pendulorum ad Horologia aptato Demonstrationes Geometricae. Paris: F. Muguet, 1673. Folio, contemporary full speckled calf , elaborately gilt-decorated spine, gilt arms on boards of Eprit Flechier, Bishop of Nimes. With full page woodcut and numerous in-text woodcuts and tables. Repairs to spine and corners, text with occasional light browning. A beautiful, fine copy with wide margins.

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