Galileo Galilei 1638 Two New Sciences

TWO NEW SCIENCES BY GALILEO THE MACMILLAN COMPANY KEW YORK • BOSTON • CHICAGO • DALLAS ATLANTA • SAN FRANCISCO MACMILLAN & CO., LIMITED LONDON • BOMBAY • CALCUTTA MELBOURNE THE MACMILLAN CO. OF CANADA, LTD. TORONTO GALILEO GALILEI. Subterman's portrait, painted about 1640; now in the Galleria di Pitti at Florence. DIALOGUES CONCERNINC TWO NEW SCIENCES BY GALILEO GALILEI Translated from the Italian and Latin into English by HENRY CREW AND ALFONSO DE SALVIO of Northwestern University WITH AN INTRODUCTION BY ANTONIO FAVARO of the University of Padua. " I think with vour friend that it has been of late too much the mode to slight the learning of the ancients." Benjamin Franklin, Phil. Trans. Nrro f nrb THE MACMILLAN COMPANY All rights reserved 02> COPYRIGHT, 1014 BY THE MACMILLAN COMPANY Set up and electrotyped. Published May, 1 "La Dynamique est la science des forces acceleratrices or retardatrices, et des mouyemens varies qu'elles doivent produire. Cette science est due entierement aux modernes, et Galilee est celui qui en a jete les premiers fondemens." Lagrange Mec. Anal. I. 221. TRANSLATORS' PREFACE OR more than a century English speaking students have been placed in the anomalous position of hearing Galileo constantly referred to as the founder of modern physical science, without having any chance to read, in their own language, what Galileo himsel…