...nearly alike. The cantilever design, which is a revival of a very ancient type, came into use. The great Forth Bridge, in Scotland, 1,600-foot span, is of this style, as are the 500-foot spans at Poughkeepsie , and now a new one is being designed to cross the St. Lawrence near Quebec, of 1,800-foot span. This is probably near the economic limit of cantilever construction. The suspension bridge can be...