IMPROVE- MENTS IN APPARATUS FOR PROPELLING VESSELS
Year: 1884

page_text: I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of
Patent Agents, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN APPARATUS FOR PROPELLING VESSELS a communication to me from
abroad by Alonso Cardoso de los Rios of New Orleans in the Parish of Orleans and
State of Louisiana, United States of America to be as follows:-
"
This invention relates to screw propellers for vessels.
According to the invention a driving shaft is located in the lower part of the
hull of the vessel, and to the rear end of this shaft is attached a screw propeller
and to the forward end is secured a pinion which meshes with two other pinions
mounted on the shafts of two other parallel screw propellers.
These propellers are made with a comparatively long axis and spiral leaves and
they may be either cylindrical or conical. The rear propeller may be conical with
the larger end hindermost, and the front propellers may be made in two sections
each, also conical, with the larger ends of the two sections turned towards each
other and the pinion arranged on a shaft between said sections. The ends of the
screws are to be supported in suitable bearings.
The propellers may be arranged in various other ways according to the form
of the vessel. With steam power the working of the propellers might be
simplified.
To protect the front propellers a peculiar shape is given to the fore front of the
vessel; and this fore front also serves as a buoy and cut water, it being hollow and
terminating in sharp angles in front.
Dated this 25th day of A. il 100s

page_text: "
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of
Patent Agents, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN APPARATUS FOR PROPELLING VESSELS (a communication to me from
abroad by Alonso Cardoso de los Rios of New Orleans in the Parish of Orleans and
State of Louisiana, United States of America, Engineer) and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
This Invention relates to screw propellers for vessels and the invention consists
of the construction hereinafter described and claimed.
In the drawings Figure 1 is a side elevation of a vessel showing the invention.
Figure 2 is a bottom plan view showing the propelling apparatus; and Figure 3 is
a cross section of two of the propelling screws.
A indicates the hull of a vessel, in the lower part of which is located a driving
shaft B. To the rear end of this shaft is attached a screw propeller C and to the
forward end is secured a pinion D which meshes with two other pinions E, E
mounted on the shafts of two other parallel, screw propellers F F. The propellers
are made with a comparatively long axis and spiral leaves and they may be either
cylindrical or conical. The rear propeller is shown as conical with the larger end
hindermost, and the front propellers are shown as made in two sections each, which
also are conical, with the larger ends of the two sections turned towards each other
and the pinion E arranged on a shaft between said sections. The end of the screws
are to be supported in suitable bearings.
The propellers may be arranged in various other ways according to the form of
the vessel. With steam power the working of the propellers might be simplified to
advantage.
To protect the front propellers a peculiar shape is given to the fore front of
the vessel as appears at G¹ in the drawings. This fore front also serves as a buoy
and cut water, it being hollow and terminating in sharp angles in front.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. The four leaved screw propeller formed with a comparatively long axis and
leaves arranged spirally about the same substantially as shown and described.
2. The screw propeller of long axis and spiral leaves made in conical form
substantially as shown and described.
3. The screw propeller of long axis and spiral leaves made in two cone shaped
sections arranged with larger ends towards each other, substantially as shown and
described.
4. The combination of the shaft, the screw propeller secured to one end thereof
and the two parallel screw propellers and means for gearing them with the other
end of the shaft substantially as shown and described.
5. The combination of the driving shaft B the conical screw propeller C arranged
with its larger end hindmost and attached to the rear end of said shaft, the two

page_text: parallel propellers F, F, made smaller at the ends than at the centre and having
pinions E and the pinion D secured to the forward end of the shaft and geared
with pinions E substantially as shown and described.
Dated this 24th day of November 1884.