Works in Iron: Bridge and Roof Structures |
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abutments adopted arch arched bridge asphalte bolts bottom flange bracing building caissoon carried cast iron catenary centre chains cofferdam compression concrete considerable construction corrugated corrugated galvanised iron cost cross girders curved cylinders deep depth derrick described diagonal diameter engineers engraving erected excavated feet galvanised guy ropes holes horizontal iron girders iron roofs ironwork kind laid lattice girders length lifted longitudinal main girders manufacture masonry material metal moving load necessary ordinary paint pieces piers pig iron placed plate girders platform Portland cement purlines rafters rails railway bridges ribs riveted roadway rolled roof covering roof principals ropes sash bars screw piles shape sheets shown in Fig side span square foot square inch steel stone stratum strength structure struts superstructure surface suspension bridges thick timber tons top flange traffic trellis trussed vertical weight wide width wood wrought iron zinc