t 8 inches from centre to centre , which are bolted to timber curbs and angle irons , and Stringers connecting the ends of the cantilevers . The planking of the footway consists of 2 - inch Memel planks bolted to the curbs . The main girders are connected together at the top by a System of diagonal… … Fig . 749 . — Upper Cross Bracing . line of the bridge . The diagonal bracing consists of tie rods 2 inches diameter , tightened with double nuts on wrought - iron palms securely rivetted to knee gussets attached to the triangulated bracings . The bridge is counterweighted with about 240 tons of…
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