Economies of Scale (1848–51)
Between 1847 and 1852, John built four separate aqueducts for the Delaware and Hudson Canal; moved his home, family, and wire rope factory from western Pennsylvania to Trenton, New Jersey; secured the contract to build a huge railroad bridge over the Kentucky River; and continued to mount substantial campaigns to win contracts to span the Ohio at Wheeling and the Niagara Gorge. The four D&H spans were mini masterpieces of engineering and planning. Each structure was very different; each required new solutions to site-specific problems. One of the spans, the Delaware Aqueduct, exists to this day, the oldest suspension bridge in the United States and one of the oldest “modern” suspension bridges in the world. On the larger projects, John again lost out to his old rival Ellet on both the Wheeling and the Niagara spans.