CERTAIN IMPROVEMENTS IN STEAM BOILERS
Year: 1873

page_text: LETTERS PATENT to Eli Heyworth, of Blackburn, in the County of
Lancaster, Manufacturer, and Nathan Wilkinson, of the same
Place, Manager, for the Invention of "CERTAIN IMPROVEMENTS IN
STEAM BOILERS."
Sealed the 3rd February 1874, and dated the 15th December 1873.
PROVISIONAL SPECIFICATION left by the said Eli Heyworth and
Nathan Wilkinson at the Office of the Commissioners of Patents,
with their Petition, on the 15th December 1873.
We, ELI HEYWORTH, of Blackburn, in the County of Lancaster,
Manufacturer, and NATHAN WILKINSON, of the same Place, Manager,
do hereby declare the nature of the said Invention for CERTAIN
IMPROVEMENTS IN STEAM BOILERS," to be as follows:-
:-
Our Invention is applicable to those steam boilers in which coils of
pipes are placed in the internal flues to utilize the heat, whereby fuel is
economised, and to promote the circulation of water in the boiler.
These coils of pipes are secured by their ends to the upper and lower
portion of the flue, and a strong current of water circulates through them

page_text: from the lower to the upper part of the boiler, and in order to prevent
cotton waste or other foreign matter being drawn into the said coils we
cover the lower orifice of the pipe by means of a perforated hood, or a grid;
or other equivalent. By this means the interior of the coil of pipes is
kept clear and the danger of burning the pipes owing to the closing of
the passage is avoided.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Eli Heyworth and Nathan Wilkinson in the Great
Seal Patent Office on the 15th June 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, ELI
HEYWORTH, of Blackburn, in the County of Lancaster, Manufacturer,
and NATHAN WILKINSON, of the same Place, Manager, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fifteenth day of December, in the year
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 us, the said Eli Heyworth and Nathan Wilkinson,
Her special licence that we, the said Eli Heyworth and Nathan
Wilkinson, our executors, administrators, and assigns, or such others as
we, the said Eli Heyworth and Nathan Wilkinson, our executors, admini-
strators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term 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 "CERTAIN IMPROVEMENTS IN
STEAM BOILERS," upon the condition (amongst others) that we, the said
Eli Heyworth and Nathan Wilkinson, our executors or administrators,
by an instrument in writing under our, or their, or one of our or 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 we, the said Eli Heyworth and Nathan
Wilkinson, do hereby declare the nature of our said Invention. and in

page_text: what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement (that is to say) :-
-
Our Invention is applicable to those steam boilers in which coils of
pipes are placed in the internal flues to utilise the heat, whereby fuel is
economised, and to promote the circulation of water in the boiler.
These coils of pipes are secured by their ends to the upper and lower
portion of the flue, and a strong current of water circulates through
them from the lower to the upper part of the boiler, and in order to
prevent cotton waste or other foreign matter being drawn into the said
coils we cover the lower orifice of each coil by means of a perforated
hood, or a grid, or other equivalent. By this means the interior of the
coil of pipes is kept clear, and the danger of burning the pipe owing to
the closing of the passage is avoided.
L
And in order that our Invention may be fully understood and readily
carried into operation, we will proceed to described the accompanying
Sheet of Drawings, reference being had to the figures and letters marked
thereon.
Fig. 1 is a transverse section and Fig. 2 a longitudinal section of an
ordinary two-flued cylindrical boiler to which our improvements are
applied. a is the outer shell of the boiler; b, b, the flues; c, the grate
bars; and d the bridge, all of which are made as usual; e, e, are coils
of copper or other pipes like those described in the Specification of
Letters Patent granted to us on the 27th day of March, 1873, No. 1147,
and which are connected to the upper and lower parts of the internal
flues b, b, to intercept and utilize the heated products of combustion
passing along the flues.
In order to prevent cotton waste or other foreign matter being drawn
into the coils of pipes by the current of water passing from the lower
to the upper part of the boiler we cover the lower orifice of each coil by
means of the perforated hood f, or a grid, or other equivalent. These
hoods or grids may be applied to the prolonged ends of the first and
second coils as shewn in Fig. 2. By means of these perforated hoods, or
grids, or other equivalents the coils of pipes are kept free from
obstruction, and consequently the danger of burning the coils is greatly
reduced if not entirely avoided.
Fig. 3 is a transverse section and Fig. 4 a longitudinal section of a
two-flued boiler to which a modification of our Invention is applied. In

page_text: this case the lower ends of the coils of pipes e are carried into the per-
forated pipes g. These pipes are united at the front end of the boiler
and connected to the blow-off pipe h.
When the boiler is at work the water circulates upwards through the
coils of pipes e as before described, but when the blow-off cock is
opened the pressure of steam causes the current through the coils to
flow in the contrary direction. By this arrangement waste and other
foreign matter is kept out of the coils e, and the circulation in them is
kept free by the currents in contrary directions above described.
Having thus stated the nature and particulars of our Invention, we
declare that we claim,―
First. The application of perforated hoods or grids to the coils of pipes
in the flues of steam boilers in the manner and for the purposes
described in reference to Figs. 1 and 2.
And, Secondly. Connecting the lower ends of the coils of pipes to the
perforated pipes g, connected to the blow-off cock, as shewn and
described in reference to Figs. 3 and 4.
In witness whereof, I, the said Eli Heyworth, for myself and on
behalf of the said Nathan Wilkinson, have hereto set my
hand and seal, this Twelfth day of June, One thousand eight
hundred and seventy-four.
ELT HEYWORTH (T. 8)