CORRESPONDENCE. THE DIFFERENT MODES OF ERECTING IRON BRIDGES.

Keywords: ERECTION, METHODS, IRON, BRIDGES, CONSTRUCTION, METALS, GIRDERS, ROLLERS, ROLLING OVER, RAILWAYS, ARCHES, FLOATING, STAGING, SPANS, PONTOONS, SUPERSTRUCTURES, BUILDING OUT, CANTILEVER, CONTINUOUS, STRESS, STRAIN, CRANES, COSTS, SCAFFOLDING