Excerpt from The Excavation of Rock by Machinery, Catalogue No. 51, 1903: Rock Drills and Stone Channeling Machines TO secure economy, the drill is so structed as to do rapid work with the 1 possible consumption Of steam or air, a simplicity and strength unite With speed lessen the cost Of the work. 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.