Improvements connected with Propellers of Canal Towing Boats.
Year: 1891

page_text: Date of Application, 8th July, 1891-Accepted; 12th Sept., 1891
COMPLETE SPECIFICATION.
Improvements connected with Propellers of Canal Towing Boats.
I, FREDERICK JULIUS BUCHENBERGER of 25 Hart Street, in the City of
Brooklyn, and the State of New York, Gentleman, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
My invention relates to an improvement in canal towing which consists of a
casing in.cylinder or any other suitable form whatsoever around propellers or screws
of boats,, and the primary object thereof is to provide a suitable covering for the
propellers or screws so that they can be used on canals without injurious effect to
the banks thereof.
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3
It has been found by practical experience that when canal and other boats are
provided with propellers or screws, as a motive power, the water which is agitated
and thrown sideways by the revolution of the screws or propellers will wash and
injure the banks of the canal, and for this reason it has been almost entirely
impracticable to use them on canal or other boats without some protection or
covering for the same.
But by my new and improved attachment which will be hereinafter fully
described and claimed, I have made it possible to use the propeller or screw motive
power on this class of boats; and this attachment consists of a cylindrical or other
form of casing arranged around the propeller and attached beneath the stern of a
boat by suitable fastening devices.
My invention consists further of certain details of construction and combination
of parts, as will more fully appear hereinafter.
To enable others to readily understand my invention I have illustrated the
same in the accompanying drawings, in which
Fig. 1 is a side elevation of the stern of an ordinary canal boat with my improved
safety attachment in cylinder form secured thereto in its proper position around the
screw or propeller.
Fig. 2 is a perspective view looking through the covering in cylinder form and
showing propeller or screw inside of it.
Fig. 3 is a modified form slightly curved or beveled towards the inside, on the
rear end.
Referring to the drawings in which like letters of reference denote corresponding
parts in all the figures.
A designates the covering which consists of a hollow cylindrical shell or case
constructed out of some strong material, as boiler iron for instance; to be of
cylinder or other form open at each end; said covering may run through in a
straight line, or may be slightly curved or beveled towards the inside on the rear
end; thus condensing the water into a smaller space and discharging it through
such contracted end.
The covering or case is securely fastened to the stern of a canal boat B under the
projecting end thereof and is secured to the boat by suitable fastening devices.
The propeller or screw a is arranged within the covering or case, in the forward
portion thereof, and it is adapted to be revolved on its shaft d freely within the
shell or case.
As the water flows freely through this shell or case and the screw or propeller
is operated at or near the front end thereof, the water agitated by said screw or
propeller will be conducted rearwardly in a straight line through the covering,
and the liability of its washing and injuring the banks of the canal is obviated.
It will be seen that my improvement is not only very effective and simple, but

page_text: also inexpensive; as it can be easily attached to the stern of any ordinary boat
without involving much expense.
The great advantage of my improvement will be at once apparent, as it will do
away with the present primitive slow and expensive mode of canal towing.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what 1
olaim is
1. A covering or case in cylinder or any other suitable form whatsoever, in com-
bination with a boat, having a screw or propeller, said covering or case to be
arranged around the screw or propeller and secured firmly to the stern of the boat,
said covering or case may run through in a straight line from end to end or be
slightly curved or beveled towards the inside on the rear end.
2. In combination with a boat having a screw or propeller, a shell or case
arranged around said screw or propeller and secured rigidly to the stern of the
boat wholly beneath the same in front of rudder, substantially as and for the
purpose set forth.
111901
'S. S. BROMHEAD,.
97, Newgate Street, London, E.C., Agent for Applicant.