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FEBEO-CONCRETE BRIDGES. Tub Grafton bridge is not likely to hold for long tho pride of place as possessing tho longest span of any concrete bridge in the worhl. The Henry Hudson memorial bridge, which the Bridge Department of New- York City has approved of, is to be built of reinforced concrete, and its proportions are to be so great that* theio is no existing masonry structure with which itcan be compared, its concrete arch being of unprecedented span, weight, and carrying rapacity. The longest arch is the Upper Niagara eteel bridge, which measures 840 ft, centre it centre of end hinges; and the largest in contemplation is the 1000 ft, fourtrack, steel railway arch, designed to carry the connecting railway across the East River at, New York. When we come to masonry or concrete bridges, however, there is an immediate drop in dimensions. The largest concrete arch at present completed is the Grunwald bridge, of 230 ft span, at Munich. . The Walnut' Lane concrete bridge at Philadelphia, now under construction, measures 2i3ft between abutments; but it is a vast jump from these dimensions to the span of 703 ft clear between the abutments of the Hudson memorial bridge. Coming to stone bridges, the most widely known of the great arches is the Cabin John arch of tlie Washington aqueduct, which is 220 ft in span. Other largest masonry arches are the Luxemburg, of 278 ft span, and that, of Piauen, measuring 295 ft. The span of the. Grafton bridge is 320 ft.

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NOTES AND COMMENTS., New Zealand Herald, Volume XLV, Issue 13780, 19 June 1908

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NOTES AND COMMENTS. New Zealand Herald, Volume XLV, Issue 13780, 19 June 1908

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