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Horologium Oscillatorium
''Horologium Oscillatorium: sive de motu pendulorum ad horologia aptato demostrationes geometricae'' (Latin: ''The Pendulum Clock: or geometrical demonstrations concerning the motion of pendula as applied to clocks''), often abbreviated ''Horologium Oscillatorium'', is a book published by Christiaan Huygens in 1673; it is his major work on pendulums and horology. This work is regarded as one of the three most important work done in mechanics in the 17th century, the other two being Galileo Galilei’s ''Discourses and Mathematical Demonstrations Relating to Two New Sciences'' (1638) and Isaac Newton’s ''Philosophiæ Naturalis Principia Mathematica'' (1687).
This work contains descriptions of clock designs, analysis of pendulum motion, and a theory of curves. Huygens re-derived Galileo's original study on falling bodies based on clearer logical framework, obtained the solution to the tautochrone problem as given by a cycloid curve and not a circle as Galileo had conceived, and outlined a theory of evolutes and rectification of curves. Huygens also obtained solutions to dynamical problems such as the period of an oscillating simple pendulum as well as a compound pendulum, center of oscillation and its interchangeability with the pivot point,〔 gives a detailed description of Huygen's methods〕 the laws of centrifugal force for uniform circular motion, and the concept of moment of inertia.
write that, as well as being known for its science, the book is also known for its strangely worded dedication to Louis XIV.〔.〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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