Built by Oliver Evans and shown in Philadelphia in 1805. Powered by a 5 HP steam engine that Evans designed. This Oruktor Amphibolos was an amphibian, it moves on land and in the water.
It was the first self-powered land vehicle in the United States which moved through the water quite well, but steering on land was awkward.
Oliver Evans wrote many publications and invented many machines including a wool carding machine, automated grist mill and a high-pressure steam engine. Some historians doubt that the Oruktor Amphibolos ever got past the drawing stage.