121 MUNN & COMPANY Editors and Proprietors. MEASURING MECHANICAL POWER-THE UNRELIABIL ITY OF BELTS. Con tents : THE IMPORTANCE OF LEARNING A TRADE THE EAST RIVER BRIDGE. THE CAREER OF A WORKING MAN. COMPARATIVE WEIGHT OF ENGLISH AND AMERICAN SCREW ENGINES. TRIAL OF STEEL RAILS-NOVEL RAILROAD OFFICE. AGRICULTUR4L ENGINEERING., scientific american, 1867-08-24
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