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For thirty years or more the expressions “Correlation of the Physical Forces” and “The Conservation of Energy” have been common, yet few persons have taken the necessary pains to think out clearly what mechanical changes take place when one form of energy is transformed into another. Since Tyndall gave us his book called Heat as a Mode of Motion neither lecturers nor text-books have attempted to explain how all phenomena are the necessary outcome of the various forms of motion. In general, phenomena have been attributed to forces—a metaphysical term, which explains nothing and is merely a stop-gap, and. | THE MACHINERY OF THE UNIVERSE MECHANICAL CONCEPTIONS OF PHYSICAL PHENOMENA BY A. E. DOLBEAR A.B. A.M. M.E. Ph.D. PROFESSOR OF PHYSICS AND ASTRONOMY TUFTS COLLEGE MASS. PUBLISHED UNDER GENERAL LITERATURE COMMITTEE. LONDON SOCIETY FOR PROMOTING CHRISTIAN KNOWLEDGE NORTHUMBERLAND AVENUE W.C. 43 QUEEN VICTORIA STREET E.C. Brighton 129 NORTH STREET. New York E. J. B. YOUNG CO. 1897. PREFACE For thirty years or more the expressions Correlation of the Physical Forces and The Conservation of Energy have been common yet few persons have taken the necessary pains to think out clearly what mechanical changes take place when one form of energy is transformed into another. Since Tyndall gave us his book called Heat as a Mode of Motion neither lecturers nor text-books have attempted to explain how all phenomena are the necessary outcome of the various forms of motion. In general phenomena have been attributed to forces a metaphysical term which explains nothing and is merely a stop-gap and is really not at all needful in these days seeing that transformable modes of motion easily perceived and understood may be substituted in all cases for forces. iv In December 1895 the author gave a lecture before the Franklin Institute of Philadelphia on Mechanical Conceptions of Electrical Phenomena in which he undertook to make clear what happens when electrical phenomena appear. The publication of this lecture in The Journal of the Franklin Institute and in Nature brought an urgent request that it should be enlarged somewhat and published in a form more convenient for the public. The enlargement consists in the addition of a chapter on the Contrasted Properties of Matter and the Etherf a chapter containing something which the author believes to be of philosophical importance in these days when electricity is so generally described as a phenomenon of the ether. A. E. DOLBEAR. v TABLE OF CONTENTS CHAPTER I Ideas of phenomena ancient and modern metaphysical and mechanical Imponderables Forces
