IMPROVEMENTS STERN-POSTS AND PARTS CONNECTED THEREWITH OF SCREW-PROPELLER STEAM VESSELS, CHIEFLY DESIGNED TO PROVIDE FOR THE CIRCULATION OF IVATED THROUGH THE CONDENSERS THEREIN."
Year: 1881

page_text: LETTERS PATENT to Edward Hayes, of Watling Works, Stony Stratford, in
THE
the County of Bucks, Engineer, for an Invention of "IMPROVEMENTS
STERN-POSTS AND PARTS CONNECTED THEREWITH OF SCREW-PROPELLER
STEAM VESSELS, CHIEFLY DESIGNED TO PROVIDE FOR THE CIRCULATION OF
IVATED THROUGH THE CONDENSERS THEREIN."
PROVISIONAL SPECIFICATION left by the said Edward Hayes at the
Office of the Commissioners of Patents on the 17th December 1881.
"
EDWARD HAYES of Watling Works Stony Stratford in the County of Bucks,
Engineer. IMPROVEMENTS IN THE STERN POSTS, AND PARTS CONNECTED
THEREWITH, OF SCREW PROPELLER STEAM VESSELS, CHIEFLY. DESIGNED TO
PROVIDE FOR THE CIRCULATION OF WATER THROUGH THE CONDENSERS THEREIN."
This Invention has for its object to provide means whereby the action of the
screw propeller of a steam-vessel is utilized to maintain a circulation of water
through the condensers of the steam-engines and pipes connected therewith or
through any other apparatus contained in the said vessel or through portions of
the latter.
The said Invention consists chiefly in the novel construction of the stern-post
and the formation of a chamber therein or adjacent thereto as hereinafter described.
That is to say, I provide the vessel with a hollow stern-post or a stem post
enclosing a chamber, and I provide long vertical narrow apertures or passages
which open into the said chamber in such a position that when the boat or vessel
is afloat the water outside of the said chamber has free access to the same. These
apertures are preferably arranged one above and one below the screw shaft
exactly in front of the propeller and the shape of these apertures gives them an
area which is much more advantageous for the action of the screw than could be
obtained by the use of an ordinary tube passed through the stern-post. The said
chamber is separated from the interior of the vessel by a water-tight bulkhead
This
and is provided with a tube through which extends the screw-shaft.

page_text: bulkhead excludes the water from all parts of the vessel except those portions of
the same to which it is desired the water shall have access or from which it shall
flow.
For establishing communication between the said chamber and the condenser or
other portions of the vessel or apparatus therein I provide a pipe or pipes of
suitable diameter extending therefrom to the bulkhead.
The said chamber may have its upper portion either closed or open. The upper
and lower portions may be divided or undivided and the said pipe or pipes may be
fixed in either the lower or the upper portion of the bulkhead as found most
convenient.
With the above described arrangement of the apertures in the stern-post and
the pipe or pipes connected with the chamber, when the propeller is driving the
vessel forward the water will be drawn outward from the said chamber and if the
action of the screw is reversed the water will be forced into the said chamber the
result being in either case the circulation of the water through the said condenser
or other apparatus or portion of the ship and the pipe or pipes whereby the same is
connected with the aforesaid chamber.
I prefer that the said pipe or pipes should terminate in the bulkhead but if
desired the same may be continued to the slots or apertures in the stern-post.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Edward Hayes in the Great Seal Patent Office on the 17th June
1882.
EDWARD HAYES, of Watling Works Stony Stratford in the County of Bucks
Engineer "IMPROVEMENTS IN THE STERN-POSTS, AND PARTS CONNECTED
THEREWITH, OF SCREW-PROPELLER STEAM-VESSELS, CHIEFLY DESIGNED TO PROVIDE
FOR THE CIRCULATION OF WATER THROUGH THE CONDENSERS THEREIN."
This Invention has for its object to provide means whereby the action of the
screw-propeller of a steam-vessel is utilized to maintain a circulation of water
through the condenser or condensers of the steam-engines, and pipes connected.
therewith, or through any other apparatus contained in the said vessel, or through
portions of the latter.
The said Invention consists chiefly in the novel construction of the stern-post
and the formation of a chamber therein, or adjacent thereto, as hereinafter described,
and as illustrated in the accompanying Drawing, in which :-
Figure 1 is a sectional side elevation of a portion of a vessel embodying my
Invention.
Figure 2 is a rear elevation showing the stern-post in section.
Like letters indicate the same parts in both of these Figures.
In carrying the said Invention into practice I provide the vessel with a hollow
stern-post, or a stern-post enclosing a chamber, as shown at a, and I form long
vertical narrow apertures. passages, or slots 6b which open into the chamber a in
such a position that, when the boat or vessel is afloat, the water outside of the said
chamber may have free access to the same. These apertures or slots are preferably
arranged one above and one below the screw-shaft c exactly in front of the screw
or propeller d as shown, and the shape of these apertures gives them an area which
permits a much more advantageous action of the screw in forcing the water into,
or drawing it from, the said chamber than could be obtained by the use of an
ordinary tube passed through the stern-post. Moreover, theso long narrow
apertures or slots present a large area to the propeller-blades, and do not affect
materially the form or construction of the stern-post. The said chamber a is
separated from the interior of the vessel by a water-tight bulkhead e and is
provided with a tube f through which the screw-shaft c extends, as shown. This
bulk head e excludes the water from all parts of the vessel except those portions of
the same to which it is desired the water shall have access, or from which it shall
flow.
For establishing communication between the said chamber a and the condenser
or condensers or other portions of the vessel or apparatus therein, I provide a pipe
or pipes g of suitable diameter, to permit the free circulation of the water, and
extending from such portion of the vessel or apparatus to the bulkhead.
The said chamber may have its upper portion either closed or open. The upper
and lower portions are in some, but not in all, instances made separate from each
other and the said circulating pipe or pipes may be fixed in either the lower or the
upper portion of the bulkhead e as found most convenient. The ordinary or other
suitable injection and discharge valves may be utilized in connection with the
aforesaid circulating pipes.
With the above described arrangement of the apertures in the stern-post and
the pipe or pipes connected with the chamber, when the propeller d is driving the
vessel forward, the water will be drawn outward from the said chamber a, and,
when the action of the screw is reversed, the water will be forced into the said
chamber, that is to say, the flow or current of water through the said circulating

page_text: pipes from stem to stern is due to the vacuum, or partial vacuum, produced behind
the stern-post by the revolution of the propeller in driving the vessel forward
while the current or flow through the said pipes in the opposite direction is due to
the action of the leading side of the propeller-blade, which, when its motion is
reversed, exerts pressure on the water and drives the same forward through the
said aperture, the result being in either case the circulation of the water through
the said condenser or other apparatus or portion of the ship, and the pipe or pipes
which connect the same with the aforesaid chamber. A grating may be arranged
in connection with the circulating pipes to prevent the entrance of weeds or other
obstructions.
I prefer that the said pipe or pipes should terminate in the bulkhead, but, if
desired, the same may be extended or continued to the slots or apertures in the
stern-post, the said pipe or pipes in this case being constructed to coincide in form
with these slots at the part adjacent to the latter.
Having thus fully described my said Invention and the manner of performing
the same I wish it understood that I am aware that the method or principle of
causing the circulation of water through the condenser or other parts of, or in, a
steam-vessel by the action of the propeller is not new, as this method of circulation
is set forth in the Specification of Letters Patent granted to the late Edward
Hayes dated February 28th 1863 No 574; I therefore make no claim to such
method or principle otherwise than as embodied in, and carried into practice by,
my improvements as above specified, but I claim in a ship or vessel driven by a
screw-propeller.
First: The stern-post perforated with the peculiarly formed and arranged
apertures, slots, or passages for the entrance and exit of the water, which apertures
are connected by a circulating pipe or pipes with the condenser or other apparatus
or portion of the vessel, substantially as, and for the purpose, specified.
Second-The hollow or chambered stern-post perforated and separated from the
body of the vessel by the water-tight bulk-head which is connected by the said
pipe or pipes with the condenser or other apparatus or portion of the vessel
substantially as, and for the purpose, specified.
In witness whereof I the said Edward Hayes have hereunto set my hand and
seal this Fifteenth day of June in the year of our Lord One thousand eight
hundred and eighty two.
EDWARD HATED.
(L.S.)