HUYGENS, CHRISTIAN. Horologium oscillatorium sive de motu pendulorum ad horologia aptato demonstrationes geometricae. Paris: F. Muguet, 1673. Royal amorial woodcut device on title, one full-page woodcut of the pendulum, approximately 100 woodcut diagrams in text. Folio, modern quarter morocco. FIRST EDITION of Huygens most important work, containing the first mathematical analysis of the motion of the pendulum, and a general treatise on the dynamics of bodies in motion. The treatise "was the most original work of this kind since Galileo's Discorsi... It ends with 13 theorems (without proofs) on the dynamics of circular motion. Newton in the Principia acknowledges Huygen's priority here, though Huygen's work had little influence on his own." PMM 154; Dibner Heralds of Science 145; Grolier/Horblit 53; Norman 1137.