IMPROVEMENTS IN APPARATUS FOR HEATING THE FEED WATER IN STEAM BOILERS
Year: 1873

page_text: LETTERS PATENT to Thomas Arnold, of Edgeley, Stockport, in the
County of Chester, for the Invention of "IMPROVEMENTS IN APPARATUS
FOR HEATING THE FEED WATER IN STEAM BOILERS."
Sealed the 7th November 1873, and dated the 2nd September 1873.
PROVISIONAL SPECIFICATION left by the said Thomas Arnold at
the Office of the Commissioners of Patents, with his. Petition, on
the 2nd September 1873.
I, THOMAS ARNOLD, of Edgeley, Stockport, in the County of Chester,
do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN APPARATUS FOR HEATING THE FEED WATER IN STEAM BOILERS," to be as
follows:-
This Invention is designed for the purpose of economizing fuel by
heating the feed water on its passage from the feed pump to the steam.
boiler, and the Invention consists principally in carrying a branch pipe

page_text: from the ordinary feed pipe and coiling it in a serpentine form in the
bottom flue under the boiler and thence conveying it to the feed valve,
such pipe being provided with suitable taps and valves for keeping up
the circulation of the water under all circumstances.
The branch pipe (which I call the economizer feed pipe) is first
provided with a back pressure valve, below which is a short branch pipe
leading into the boiler and furnished with a stop tap, which when
opened causes the water in the boiler to circulate through the serpentine
pipe when the pumps are not at work. From the back pressure valve
the branch pipe extends downwards in front of the boiler and is carried
into the flue beneath, and after traversing the same two or more times
is brought out to the front and passes upwards to the ordinary feed valve,
a stop tap being placed below the feed valve to shut off the the com-
munication in case of accident to the serpentine pipe, and a safety valve
to prevent explosion in case of any undue pressure arising in the said
pipe. There is also a direct communication from the ordinary feed pipe
to the feed valve by a short connecting pipe which is furnished with a
stop cock. When this stop cock is closed and those on the economizer
feed pipe are opened the feed water passes through the economizer and
becomes heated before arriving at the feed valve, but if from any
accident to any part of the economizer or for any other reason it is not
desirable to pass the water through the economizer, then by opening the
said stop cock in the connecting pipe the feed water will pass direct to
the feed valve in the usual manner.
SPECIFICATION in pursuance of the conditions of the Letters Patent, 2
filed by the said Thomas Arnold in the Great Seal Patent Office
on the 2nd March 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
ARNOLD, of Edgeley, Stockport, in the County of Chester, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Second day of September, in the year

page_text: 1
of our Lord One thousand eight hundred and seventy-three, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Thomas Arnold, Her special license
that I, the said Thomas Arnold, my executors, administrators, and
assigns, or such others as I, the said Thomas Arnold, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter, during the
terin therein expressed, should and lawfully might make, use, exercise,
and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for “IMPROVEMENTS
IN APPARATUS FOR HEATING THE FEED WATER IN STEAM BOILERS," upon the
condition (amongst others) that I, the said Thomas Arnold, my
executors or administrators, by an instrument in writing under my, or
their, or one of their hands and seals, should particularly describe and
¡ ascertain the nature of the said Invention, and in what manner the
same was to be performed, and cause the same to be filed in the Great
Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Thomas Arnold, do hereby
declare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in
and by the following statement and accompanying Drawings (that is
to say):
This Invention is designed for the purpose of economizing fuel by
¡ heating the feed water on its passage from the feed pump to the steam
boiler, and the Invention consists principally in carrying a branch pipe
from the ordinary feed pipe and coiling it in a serpentine form in the
bottom flue underneath the boiler, and thence conveying it to the feed
valve, such pipe being provided with suitable taps and valves for
keeping up the circulation of the water under all circumstances.
Such being the nature and object of my said Invention, I will now
proceed to describe more in detail the manner in which the same is to be
or may be performed or carried into practical effect, and in order that
the same may be clearly understood I have annexed hereunto a Sheet
of Drawings illustrative thereof, and have marked the same with Figures

page_text: and letters of reference corresponding with those in the following expla-
nation thereof :-
Fig. 1 in the annexed Drawing is an end view, and Fig. 2 a longitu-
dinal section of a Cornish boiler, with my Invention shown as applied
thereto.
a, a, is the boiler; b, b, the internal flues, and o, c, the brick flue
under the boiler; d, d, is the ordinary feed pipe.
The branch pipe e, e, (which I call the economizer feed pipe) is first
provided with a back pressure valve ff, below which is a short branch
pipe leading into the boiler and furnished with a stop tap 9, 9, which :
when opened causes the water in the boiler a, a, to circulate through
the serpentine pipe in the bottom flue when the pumps are not at work.
From the back pressure valve f, f, the branch pipe e, e, extends
downwards in front of the boiler a, a, and is carried into the bottom
flue c, c, beneath the boiler, and after traversing the same two or more:
times in a serpentine form is brought out to the front and passes
upwards to the ordinary feed valve h, h, a stop tap i, i, being placed
below the feed valve to shut off the communication in case of accident
to the serpentine pipe, and a safety valve k, k, to prevent explosion in
case of any undue pressure arising in the said pipe e, e. There is also
a direct communication from the ordinary feed pipe d to the feed
valve h, h, by.a short connecting pipe 7, 1, the feed pipe being furnished
with a stop-cock m, m. When this stop-cock m, m, is closed and the
stop-cock i, i, on the economizer feed pipe e, e, is opened, the feed water
passes through the economizer and becomes heated before arriving at 2
the feed valve h, h, but if from accident to any part of the economizer, or
for any other reason it is not desirable to pass the feed water through
the economizer, then by opening the said stop-cock m, m, and closing
the taps g and i, the feed water will pass direct to the feed valve h, h, in
the usual manner.
Having now described the nature and object of my said Invention,
together with the manner in which the same is to be or may be per-
formed or carried into practical effect, I wish it to be understood that I
claim as my Invention, the general construction and arrangement of
apparatus for heating the feed water in steam boilers on its passage {

page_text: LO the feed valve as nerein-berore described and illustrated by the
Drawing annexed.
In witness whereof, I, the said Thomas Arnold, have hereunto
set my hand and seal, this Twenty-eighth day of February, in
the year of our Lord One thousand eight hundred and seventy-
four.