ich is of twelve inches dia-meter, will move a clear force of 11 or 12 hundred weight after thefrictions are deducted: this force is to be directed against a wheel ofeighteen inches diameter. The piston is to move about three feet,and each vibration of it gives the axis about 40 evolutions.… … * A short Account of Steam Boats, by Dr. Thornton, Director of the Patent Office,Washington, United States.—Monthly Magazine, October, 1815. 348 STEAM NAVIGATION. water six more are entered, and the two sets of paddles make theirstrokes of about eleven feet in each evolution. The crank of theaxis…
