Excerpt from Compressed Air Magazine, Vol. 26: November, 1921 Switchboard and air compressors in General one carrier is received, another 15 sent away post-office basement. 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.

Excerpt from Compressed Air Magazine, Vol. 26: June, 1921 This self-incapacitating of a liquid-oxygen explosive has its drawbacks, for it makes it imperative that the work of charging a hole be done rapidly. Even then, the miner must be sufficiently expert to place all his charges, connect the fuses or detonators, and reach a place of security within an interval of ten to fifteen minutes. How quickly the miner has to work can be grasped by the following de tails. 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.