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In the preparation of this work it has been my aim, as far as possible, to deal with the subject of Valve Gearing in a simple and interesting manner. Whilst in the main adopting the Zeuner diagram, as being the most suitable for determining the proportions of Valve Gear, I have not confined myself exclusively to that method of solution; my object being to show that valve movements may be described in various ways, each possessing its own advantages. In the First Part, chapter I. treats of the common Slide Valve and its modifications; the second chapter is devoted to Expansion Valves and Automatic Cut-off Gearing; and the remaining chapters deal with Link Motions and other Reversing Gears. The Second Part treats of Corliss Valves and Trip Gears, a branch of the subject which has hitherto received but little attention from writers on Valve Gearing. I have to acknowledge my indebtedness to several eminent firms who kindly furnished examples of the best modern gears; and I have also to thank my friend, Mr. F. H. Parker, for his assistance during the preparation of the work for press. WIGAN, June, 1897. CHARLES HURST. |