Improvement in propelling canal-boats
US 179266 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
H. I. CHAPMAN.
PROPELLING CANAL BOATS.
Patented. June 2'7, 1876.
IN- PETERS, PHOTO-LITHD 'WAISHINGTON D C HUSTON I. CHAPMAN, oF PonrLANu'oREcoN, ASSIGNOR or ONE HALF HIS RIGHT TO GEORGE H. CASE AND J. E. ROTH, OF FAIRFIELD', IOVA.
IMPROVEMENT IN PROPELLING CANAL-BOATS.
Specification forming part of Letters Patent No. 179,266, dated J une 27, 1876; application filed June 9, 1876. 7
To all whom it may concern:
Be it known that I, HUsToN I. CHAPMAN, of Portland, State of Oregon, have invented a new and useful Improvement in Propelling and Steering OanaLBoats and other vessels, which improvements are fully set forth in the following specification, reference being had to the accompanying drawings, in which Figure 1 is a perspective, and Fig. 2 is a sectional, View.
The object of my invention is to prevent the washing of the banks of canals and other waters by the erosion caused by vessels passing through the water at a greater speed than is now made by canaLboats.
The following is a specification of my antiwashing canal-boat, and mode of propelling and steering canalboats and other vessels propelled by steam.
The canal-boat is built of the ordinary size, or may be larger or smaller, with bows and stern one-half clipper. The bows are cut off at a point where the horizontal line of the plane will be about four feet, into which is built a funnel, with the apex toward the stern of the boat, as shown in Fig. 1.
'By this construction of half-clipper bows and sterns, in connection with the funnel, all the water which may not be drawn in through the funnel is allowed to pass easily outside and along the sides of the boat, thus tending to materially lessen the side swell of the water, which is so destructive to the banks of the canal.
To the funnel is attached the pipe B, connecting with the double horizontal rotary pump P, the wheels of which work toward each other, to draw the water through the bows and expel it at the stern. From the rotary pump P the pipe 0 passes through the' stern of the boat at 0, and to the end of which is attached the cylindrical rudder It, by means of which the vessel is steered. The pipes 13' er portion of the water so thrown aside from i the vessel is caused by that portion of the bows of the vessel extending from the stem to a point where the bows are about two feet from the center line of the vessel, it follows, therefore, that if this water is drawn through the vessel by means of the rotary pump P, and the funnel A and pipes B 0, there will be no wave thrown off from the bows, as the remain der ofthe water displaced will pass around the sides of the vessel without causing any wash upon the banks of the canal, and the water drawn through the boat is discharged against the density of the water the same as a screw-propeller placed within a barrel or cylinder. Thus the vessel isforced ahead, both by the water discharged from the pipe 0 and the reaction of the water, and the resistance of the water to the passage of the boat is overcome.
Over the mouth of the funnel A is placed.
the open detachable fender or bows E, perforated with holes sufficiently large to freely admit the water, but small enough to prevent debris from passing through the pipes into the pump, and forming a false bow, to afford an easy passage of the boat through the water. The lower or under side of the fender F is made tight, in order to prevent the water coming up from under the vessel into the funnel.
The fender F may be so constructed that the amount of water admitted to the funnel A may be increased or lessened, for in a narrow canal or channel the funnel should draw in all the water from the bows of the boat, while in a broad channel or canal a greater portion of the water may be made to pass around the sides of the vessel.
A canal-boat properly constructed will make from nine to ten miles per hour without making any more wash than the ordinary canal-boat running two miles per hour, while other vessels will make twenty-five to thirty miles per hour.
I am aware that boats have heretofore been constructed with channels of various forms passing through them, and provided with propellers, 850., within them, to force the water through and lessen the wash of the canalbanks, and this I do not claim, broadly; but I have found by actual experiment that a boat I constructed according" to my plan fulfills conditions necessary to a successful propulsion of canal-boats, and seems to obviate defects found in those in common use.
I claim as my invention 1. In a canal-boat, constructed substantially as described, the combination of the fun- HUSTON I. CHAPMAN. Witnesses:
E. E. MASSON, E. G. WEAVER.