Show NEW INVENTION TOR POIL STEAMBOAT WHEELS theo the boston journal says that dr pratt of that city professes to have invented paddle wheels that have no back water a great I 1 acquisition of propelling power the contrivance is simple enough the introduction of two I 1 eccentric wheels in the paddles connecting by rods placed in groves at the arms and a friction roller at each each end in making the revolutions the floats are in truth raised i out of the water perpendicularly under the 8 shaft haft and let down again when required for propulsion in this way back water is is done away with and no difficulty cark can arise from froin the clogging of the wheels by ice or drift wood |