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Excerpt from The Design and Construction of Cams The contents of this book, up to but not including Chapter X, describe the methods used by Mr'. C. F. Smith, and the illustrations up to the same point are from drawings by him. The analysis and description of these methods are by Mr. F. A. Halsey, as is the section on the monotype cams. Other chapters are credited to their authors in foot-notes. Mr. Smith has been connected with the construction of machinery involving the use of cams for twenty-five years, during fifteen of which he has made the design of such machinery a specialty. As a result of this extended experience he has developed the line of procedure which is herein explained and which is in the highest degree successful. He has designed machines containing as many as twenty cams and his experience is uni formly that given in connection with the chain-making machine illustrated in later pages. The cams are laid out on paper and constructed and key-seated from the drawings, and when assembled they perform their work in entire harmony and without filing, doctoring, or changing. Such results need no comment and it is particularly fortunate that, instead of basing the explanations on hypothetical cases, it has been possible to use as illustrations the cams of a highly successful machine. Of course, no single machine exhausts all the varieties of cams and, after showing how the cams of the chain machine were laid out and made, other varieties of cams which are not included in it are shown. Up to Chapter X these are all drawn from Mr. Smith's fund of experience and hence in no sense represent hypothetical conditions. The prejudice that exists in many quarters against the employment of cams is un founded. The movements which they are capable Of giving is unlimited, and in cases in which other means will give the movement it is often at the expense Of increased compli cation and trappy construction. Properly designed on the lines laid down, nothing can be more satisfactory than the operation Of cams, the design Of which is not a matter of good luck or of expensive experiment, but results directly from the intelligent application of general principles. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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