AND RELATING TO SCREW PROPELLERS
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by the said James Taylor at the Office
of the Commissioners of Patents on the 21st August 1880.
JAMES TAYLOR, of Birkenhead, in the County of Chester.
AND RELATING TO SCREW PROPELLERS."
"
IMPROVEMENTS IN
My Invention has for its object certain improvements in screw propellers, more
particularly applicable where screw propellers are applied in twin or like form,
and consists in surrounding the blades of the propeller with a ring of metal,
preferably a flat ring (horizontally placed). Between the blades of the propeller
and on the inner surface of the ring I form additional vanes or fins, which may
be set to the same pitch as the propeller blades. The outside of the ring may also
in some instances be supplied with additional vanes or fins, pitched evenly round
the periphery of the ring. The ring and vanes may be cast in one piece with the
screw propeller, or may be made separately and built up.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said James Taylor in the Great Seal Patent Office on the 19th February
1881.
JAMES TAYLOR, of Birkenhead, in the County of Chester.
AND RELATING TO SCREW PROPELLERS."
"IMPROVEMENTS IN
My Invention has for its object certain improvements in screw propellers, more
particularly applicable where screw propellers are applied in twin or like form,
and consists in surrounding the blades of the propeller with a ring of metal,
preferably a flat ring, horizontally placed outside and round the blades of the
propeller, and on the inner surface of the ring I form additional vanes or fins,
The outside of the
which may be set to the same pitch as the propeller blades.
ring may also in some instances be supplied with additional vanes or fins, pitched
evenly round the periphery of the ring. The ring and vanes may be cast in one
piece with the screw propeller, or may be made separately and built up.
That my Invention may be clearly understood I have bereunto attached a Sheet
of Drawings illustrative thereof marked with letters and figures of reference corre-
sponding with those in the following explanation, like letters and figures being
used to denote the same or corresponding parts throughout the various views.
In the Drawings,―
Figure 1 is an end elevation of a propeller constructed according to my
Invention.
Figure 2 is a side elevation of Figure 1 shown partly in section, and showing
the set out of the blades.
Figure 3 is a plan of the ring at X, Figure 1, showing the butt and method of
attaching the inner vanes.
Figure 4 is a plan of the ring at Z, Figure 1, showing the pitch of the inner
vanes.
Figure 5 is a modification of Figure 1.
Figure 6 is an outside view of Figure 5.
Upon reference to the Drawings, A is the propeller boss; B, the propeller blades,
which are surrounded by the ring C, which, in the Drawing, consists of two rings
rivetted to the blades B at their outer ends D, having butt joints as shown at
Figure 3; E are the inner or additional vanes or fins, which are set to the same
pitch as the blades B and rivetted to the ring C, as shown at Figure 4.
In the example shown at Figures 5 and 6, F are additional vanes or fins pitched
evenly round the periphery of the ring C, and used in combination with the inner
vanes E.
The essential features of my Invention are,-
First. Combining with the propeller blades B an outer ring C, on which are
pitched the inner vanes E.
Second. Combining with the propeller blades B an outer ring C, on which are
pitched the inner vanes E in combination with the outer vanes F.
My Invention has been particularly designed for the use of quadrupal screw
steamers, such as those used for the Birkenhead goods traffic on the river Mersey,
but my Invention is also applicable to be used for twin or single screw purposes.
The advantages of the operation of my Invention are increased strength of
propeller, effective propelling surface, and effective impeding surface when the
propeller is stopped, and, in the case of bow screws, freedom from danger of fouling
mooring chains.
In conclusion I would state that I do not intend to confine the Patent, of which
this is the Specification, to the identical form of propeller shown in the Drawings,
as the same is capable of various modification. I would also state that I do not

page_text: claim as my Invention the separate use of the outer vanes F, as I am aware that
outer vanes mounted on a broad hoop have been used prior to my Invention,
and are mentioned in the Specification of Patent granted to John Ericsson, No. 7149,
A.D. 1836.
What I claim as my Invention and secured to me by Letters Patent as aforesaid
is,-
First. The use of an outer ring, such as C, with inner vanes, such as E, in combi-
nation with a propeller, such as B, as herein described and shown at Figures 1, 2,
3, and 4, of the Drawings hereto annexed.
Second. The construction and arrangement of propeller, substantially as herein
described and shown at Figures 1, 2, 3, and 4 of the Drawings hereto annexed.
Third. The use of an outer ring such, as C, with inner vanes, such as E, and outer
vanes, such as F, in combination with a propeller, such as B, as herein described and
shown at Figures 5 and 6 of the Drawings hereto annexed.
Fourth. The construction and arrangement of propeller, substantially as herein
described and shown at Figures 5 and 6 of the Drawings hereto annexed.
In witness whereof, I, the said James Taylor, have hereunto set my hand and
seal, this Sixteenth day of February, in the year of our Lord One thousand
eight hundred and eighty one.
JAMES (L.S.) TAYLOR.