“The Comet constructed at Pittsburg in the spring of 1813, for Mr.
Smith, is 52 feet long and 8 feet beam, cylinder 6¼ inches diameter,
18 inches stroke, vibrating motion, no condenser or air-pump. The
water wheel in the stern, 6 feet diameter, 8 paddles 2 feet 6 inches
long and 11 inches wide. The boiler 14 feet long, 2 feet 6 inches
wide, with a flue high, steam from 50 to 60 pounds to the inch square,
20 to 30 double stroke a minute. _This is Evans’s idea of steam power
by high steam. It was the Marquis of Worcester’s 120 years ago; and
Mr. Watts 30 years ago tried and abandoned it._”