LA HIRE, Philippe.

Memoires de Mathematique et de Physique, contenant un Traité des Epicycloïdes, & de leurs usages dans les Mechaniques. L'explication des principaux Effets de la Glace & du Froid. Une Dissertation des Differences des Sons de la Corde de la Trompette Marine. Un Traité des differens Accidens de la Vûe, divisé en deux Parties.

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Woodcut vignette on title & numerous woodcut diagrams & illus. in the text. 4 p.l., 302 (i.e. 202) pp., 1 leaf. Large 4to, antique sheep, red morocco lettering piece on spine. Paris: de l'Imprimerie Royale, 1694. First edition. La Hire (1640-1718), was for nearly half a century one of the principal animators of scientific life in France. Appointed to the chair of mathematics at the Royal College in 1682, he taught courses in mathematics (pure and applied), astronomy, hydrostatics, dioptrics, and navigation. The present book reflects La Hire's wide interests. The first treatise contains his valuable essay on epicycloids and their application to mechanics. It is here that La Hire describes his discovery that a wheel with cycloidal teeth is most efficient because it creates least friction. The second treatise contains an investigation of the thermometer. La Hire was, at the end of the century, responsible for the meteorological observations at the Paris Observatory. The third memoir is concerned with an acoustical problem. The final treatise, divided into two parts, is devoted to optics and the mechanics of eyesight. His interest in physiological optics was caused by its role in astronomical observation and by its relationship to artistic technique. Fine copy. Ex Bibliotheca Mechanica. D.S.B., VII, pp. 576-79. Smith, Hist. of Mathematics, I, p. 386.

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