| Description | 2 sheets. On the same sheets: Memorandum. Experiments with the James Watt. 13—15 Nov. 1821. Docketed “Further experiments with the James Watt. First: half the paddles immersed 3 feet, the other half 2 feet 6 inches – speed 9.49 miles per hour. Second: three fourths of the paddles immersed 3 feet – speed 9.73 miles per hour. Third: paddles on the inner half of the wheels only & immersed 3 feet – speed 9.17 miles per hour. Fourth: one engine only, paddles as before – speed 6.95 miles per hour. Fifth: one engine only, paddles on inner division only, immersed 2 feet 6 inches – speed 7.69 miles per hour. Sixth: one engine only, all the paddles on, immersed 2 feet 6 inches – speed 7.13 miles per hour. Seventh: all the paddles on and both engines. Difference of speed with the paddle wheels 9 feet wide and when 4½ feet wide = 0.87 miles per hour. Vessel proposed to be tried at sea.” |