A BRIEF TREATISE ON CONSTRAINED BY JOHN H. BARR, M.S., M.M.E., Professor of Machine Design, Sibley College, Cornell University With over Two’Hundred Figures. FIRST EDITION. SECOND THOUSAND. NEW YORK: JOHN WILEY & SONS. LONDON: CHAPMAN & HALL, LIMITED. PREFACE. THIS book is the outgrowth of a somewhat smaller treatise which was prepared and printed by the writer in 1894 for the use of the classes in mechanical and electrical engineering at Sibley College, Cornell University. After having used the original for several years, it was decided to issue the work in revised form, making such corrections and changes as experience suggested. The present volume was prepared especially to bring together, and to present to the students in a condensed text-book, those principles and methods which are deemed most important in a general course on Kinematics. This is the only excuse offered for another book on a subject about which so much has been written. No pretension is made to originality except in the arrangement and manner of presenting a few subjects. Neither is the present work offered as in any sense a complete treatise on the Kinematics of Machinery. The treatment of many topics has been much abridged; particularly the portion relating to toothed gearing, a subject which is exhaustively treated in numerous available works. On the other hand, the discussions of the applications of such important conceptions as instantaneous centres, velocity diagrams, etc., are rather fuller than are found in many of the shorter works on Mechanism. The treatment of these subjects follows closely that given by Professor Kennedy in his admirable work on the Mechanics of Machinery. It is believed that the presentation of principles and methods, with illustrations of their applications, is the proper line to adopt |