Excerpt from Mine Drainage: Being a Complete Practical Treatise on Direct-Acting Underground Steam Pimping MachineryThe period that has elapsed since the First edition of this work made its appearance has been characterised by considerable activity in the domain of pump design and manufacture, and by the adoption of higher ranges of steam pressure, as the succeeding pages will attest. Many of the engines in use when the work was first published have in the severe ordeal of underground work maintained their position as useful and effective pumping agents others have failed, and are now only a name in the chronicle of mine pumps. But the introduction of new types has gone on apace, and we are to-day in the presence of a bewildering variety of steam-pumping appliances.In preparing this new edition, the Author has endeavoured to give expression and consideration to these changes and develop ments in Underground Steam-pumping Machinery commensurate with their importance. He says 'underground' advisedly, as 'surface' engines are only referred to incidentally and for the purpose of comparison.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.