Journal of the Franklin Institute of the State of Pennsylvania, for the Promotion of the Mechanic Arts, 1859, Vol. 67

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Excerpt from Journal of the Franklin Institute of the State of Pennsylvania, for the Promotion of the Mechanic Arts, 1859, Vol. 67: Devoted to Mechanical and Physical Science, Civil Engineering, the Arts and Manufactures, and the Recording of American and Other Patent Inventions Upon the miles of the railway lines in the United States, it is here estimated that 8125 miles of the timber superstructure of their track are annually renewed, requiring an outlay of dollars to furnish the supply. 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.