MECHANICAL DRAWING AND ELEMENTARY MACHINE DESIGN A Treatise Comprising the First Principles of Geometric and Mechanical By F. L. SYLVESTER, M.E. By ERIK OBERG Associate Editor of "Machinery," Author of "Hand-Book of Small SCIENCE FULLY ILLUSTRATED NEW YORK THE NORMAN W. HENLEY PUBLISHING CO. 132 NASSAU STREET 14893i DEC 1 9 1910 6099026 PREFACE THE demand for an elementary treatise on mechanical drawing, including the first principles of machine design, and presented in such a way as to meet, in particular, the needs of the student whose previous theoretical knowledge is limited, has caused the author to prepare the present volume. It has been the author's aim to adapt this treatise to the requirements of the practical mechanic and young draftsman, and to present the matter in as clear and concise a manner as possible, so as to make "self-study" easy. In order to meet the demands of this class of students, practically all the important elements of machine design have been dealt with, and, besides, algebraic formulas have been explained and the elements of trigonometry have been treated in a manner suited to the needs of the practical man. In arranging the material, the author has first devoted himself to mechanical drawing, pure and simple, because a thorough understanding of the principles of representing objects greatly facilitates further study of mechanical subjects; then, attention has been given to the mathematics necessary for the solution of the problems in machine design presented later, and to a practical introduction to theoretical mechanics and strength of materials; and, finally, the various elements entering in machine design, such as cams, gears, sprocket wheels, cone pulleys, bolts, screws, couplings, clutches, shafting, fly-wheels, etc., have been treated. This arrangement makes it possible to present a continuous course of study which is easily comprehended and assimilated even by students of limited previous training. Portions of the section on mechanical drawing was published by the author in The Patternmaker several years ago. These articles have, however, been carefully revised to harmonize with the present treatise, and in some sections amplified. In the preparation of the material, the author has also consulted the works of various authors on machine design, and credit has been given in the text wherever use has been made of material from such sources. Several important additions have been made by Mr. Erik Oberg, Associate Editor of Machinery. In the preparation of these additions, use has partly been made of material published from time to time in Machinery. APRIL, 1910. THE PUBLISHER. |