There is a model of a steamboat to be seen on the Chesapeake, invented and constructed by Cyrus Williams, Esq., which is exciting considerable interest among steamboat men. It is in the usual form of a boat, but more flat-bottomed, and much longer in proportion to its width, than the boats now in use, giving it a greater surface to the water, and of course a lighter draught. The improvement is in applying the bridge principle of bearers in supporting length of boats. It looks perfectly feasible. Mr. Williams thinks it will be a great saving of expense, as it takes much less timber, and all of it can be sawed in a mill, being straight stuff. He offers to build a boat on this model, furnishing one third of the stock, and if it does not make 25 miles to the hour, he will forfeit his share.