Theodore Burr’s arch-truss design, which he patented in 1806 and 1817, was used for this 1804 bridge over the Hudson River at Waterford. (“American Railroad Bridges,” 1889. Snell Library, Northeastern University via Internet Archive)
Theodore Burr’s arch-truss design, which he patented in 1806 and 1817, was used for this 1804 bridge over the Hudson River at Waterford. (“American Railroad Bridges,” 1889. Snell Library, Northeastern University via Internet Archive)