Note 373 — Chapter XXI · Application of Steam-power to Navigation—Miller and Symington—Boulton and Watt’s Engine adopted by Fulton.

“I am now satisfied,” he said, “that Mr. Symington’s steam-engine is the most improper of all steam-engines for giving motion to a vessel, and that he does not know how to calculate frictions or mechanical powers. By means of a new well-constructed valve-wheel, and the pinion being doubled in diameter, I doubt not that the velocity of the vessel’s motion will be increased; but, do as you will, a great deal of power of the engine must be lost in friction. I remember well that when the small engine was wrought in the boat at Dalswinton, I had formed the same idea, and that I told you so; but not having studied the subject, I gave up my own common sense. This is now past remedy. As the engine cannot be of use to me now, I hope, with the aid of Mr. Tibbets and Mr. Stainton, you will get it sold before you leave Carron.”—Miller to Taylor, 7th December, 1789.