The Steamer CAIRO. -- A Canal boat bearing this title reached our place on Thursday last, from Newcastle, Lawrence County. She came over the water at the rate of three miles an hour, showing a capacity about equal to four horsepower; and in a trip on the Bay on Friday afternoon moved at the rate of eight miles an hour.
      The CAIRO is propelled by two oscillating engines of 10 inch fore and 10 inch stroke, having a double slide valve with improved valve motion. They occupy only about 3 x 6 feet, and can be reversed in a second of time or stopped without shutting off steam. The engines were invented and built by Mr. R. L. Steen -- who is evidently an ingenious mechanic - are perfectly simple in construction and so well adapted to the intended purpose that they can hardly fail to be extensively adopted. The boat is commanded by Capt. H. B. Steen, and will run from Newcastle to Erie until the water rises in the river, when she will perform regular trips between Newcastle and Rochester. Boats propelled by steam are in general use on the N. Y. Erie Canal, and we trust the day is not far distant when they will be extensively adopted on our various lines if inland navigation.
      Erie Gazette
      July 16, 1863