Internal Improvements (1838–41)
John left farming in the wake of the panic of 1837 and found work as a surveyor, eventually working on a series of canal projects around western Pennsylvania, where he met Charles Schlatter. Despite his evident ability and expertise, John was doing little more than grubbing around for piecemeal surveying work before linking up with Schlatter. In 1838, Pennsylvania placed Schlatter in charge of surveying three potential railroad routes across the state, and he immediately drafted John to help. While submitting his survey report to the state authorities in Harrisburg, John got embroiled with Charles Ellet in a competition to build the first long span suspension bridge in the United States, over the Schuylkill River in Philadelphia. Ellet won the contract, instituting a rivalry that would last much of the next twenty years.