was intended to fill up the spaces above the dividing ribs with acomposition of hard pulverised limestone or granite, and pitch,rendering the whole compact and impervious to wet. The permanent way over the railway and footpath would be 282 TEOPOSED TUBULAR AND TUBULAR GIRDER BRIDGES, laid with… … The computed strength of the bridge is equivalent to a strainof 12 tons per lineal foot for the railwa}^, and 8 tons per lineal FOE CROSSING TUE EIIINE AT COLOGNE. 283 foot for the carriage-wiiy and footpaths ; making the hearingpowers of one foot across every part of the hridge equal to20 tons.…
Building, Iron and steel
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