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The seeds had found lodgment some years previously. Dickenson shows that in 1793, or about the time when he retired from his art career, Fulton wrote a letter to the Earl of Stanhope stating that he had a project for moving boats by steam. This was a subject in which Stanhope took particular interest, being an inventor and a great student of applied science, and especially as he at that same time was working on a design of his own for a steamboat. Lord Stanhope requested Fulton to present his plan in detail. The original letter and accompanying sketches, dated November 4th, 1793, are still in the possession of the Stanhope family.

The idea of propelling boats by steam was not new. Jonathan Hulls had published a pamphlet in 1737 entitled, “A Description and Draught of a New Invented Machine for Carrying Vessels Out of or Into Any Harbour, Port or River, Against Wind or Tide or in a Calm.” This pamphlet is of great rarity, and the plate it contains, being the first pictorial representation of a boat propelled by the force of steam, merits reproduction. But in Fulton’s own country practical results had already been achieved. James Rumsey had actually moved a vessel by steam on the Potomac in 1785–88, and in 1788 and 1790 took out British patents. In February, 1793, Rumsey ran a steamboat on the Thames. Equally important was the work of John Fitch, who also constructed a boat operated by a steam engine and actually conveyed passengers on a regular schedule on the Delaware River in 1790. Fitch, like his rival inventor Rumsey, went to Europe further to develop his ideas and, in 1791, took out a French patent. All these experiments were, of course, known to Fulton and it is not impossible that they gave him his first suggestion.