Robert Fulton
The first successful trial run of a steamboat had been made several years earlier in the United States by inventor John Fitch, on the Delaware River on August 22, 1787. Attendees included delegates from the Constitutional Convention, who were observing while taking a break from their summer-long sessions at Independence Hall. The steamboat was propelled by a bank of oars on either side of the boat. The following year Fitch launched a boat powered by a steam engine driving several stern-mounted oars. These oars paddled in a manner similar to the motion of a swimming duck's feet. With this boat he carried up to thirty passengers for hire on numerous round-trip voyages on the Delaware River between Philadelphia and Burlington, New Jersey.
Dumfries
After working with Patrick Miller of Dalswinton, inventor William Symington intended to carry out a trial in order to show than an engine would work on a boat without the boat catching fire. The trial finally took place on Dalswinton Loch near Dumfries on 14 October 1788. The experiment demonstrated that a steam engine would work on a boat. Symington went on to become the builder of the first practical steamboat.