Excerpt from The Journal of the Franklin Institute, Vol. 74 of 104: Devoted to Science and the Mechanic Arts We think we have found the means for attaining this end, in the use of water-spray, which could be introduced into the cylinder of the compressor, and into that of the machine using the air in the mine. We have not indicated the practical details which permit the realization of our plan, but we appeal in behalf of this subject, to all constructing engineers. If they succeed, we may rest assured that the use of compressed air in mines will soon become general. We can likewise predict that the problem of mining at any depth will be solved. 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.