THE PROPORTIONS AND MOVEMENT OF SLIDE VALVES. BY WILLIAM DYSON WANSBROUGH, Author of "The A B C of the Differential Calculus," 'The Portable Engine; its Construction and Management," etc., etc. Price 4s. 6d. Net. 1903. THE TECHNICAL PUBLISHING CO., LTD., MANCHESTER, AND ALL BOOKSELLERS. 76994 MAR 9 1904 PREFACE. 6951718 Some explanation of the re-appearance of these articles in book form, so long after their original publication, may be offered. From time to time many requests for re-publication have reached the author, both directly and through the publishers, from users of the articles, who felt the inconvenience of tracing the particular case required through a series of trade numbers. The Author's thanks are due to the Proprietors of The Mechanical World, in which the series originally appeared, for their courtesy, which has enabled him to collect and reprint the articles in what he hopes will prove a convenient and acceptable form for reference. Lincoln, March, 1903. |