Excerpt from The North of England Institute of Mining and Mechanical Engineers Transactions, 1902-1903, Vol. 53 The Institute is not, as a body, responsible for the statements and advanced in the papers which may be read, nor in the discussions W may take place at the meetings of the Institute. 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.