Excerpt from Treatise on Valve-Gears: With Special Consideration of the Link-Motions of Locomotive Engines<br><br>The slide-valve gears are those which are most applied and most important, and as also they alone induce R theoretical studies of the distribution of steam effected through them, an investigation into the seldom-applied valve and cock-gears has been entirely omitted in the following treatise. The slide-valve consists generally of a hollowed plate, which moves backwards and forwards over the entrances of the steam-ports; or if the slide-valve acts as a ao-called expansion slide-valve, it only consists of a single plate, which may or may not have slots or ports for the admission of steam.<br><br>About the Publisher<br><br>Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com<br><br>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.