The Uses of Compressed Air

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Excerpt from The Uses of Compressed Air: With IllustrationsThis fact has a bearing upon the question of providing quick transit in cities built upon a rock foundation, inasmuch as modern engineering permits the construction of tunnels in rock with celerity, and comparatively small cost, and without large land damages. It is Claimed by experts in the construction of tunnels that a deep tunnel system (which may contain a four-track railroad, to be laid in two decks, of two tracks each), can be built and lined with white glazed brick and provided with suitable Shafts, within the limit of cost of two million dollars per mile, excluding the cost of surface stations.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.