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,
1
T
Manager, for the Invention of IMPROVEMENTS IN STEAM BOILERS.
PROVISIONAL SPECIFICATION left by the said Eli Heyworth and
Nathan Wilkinson at the Office of the Commissioners of Patents,
with their Petition, on the 27th March 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 "IMPROVEMENTS
IN STEAM BOILERS," to be as follows:-
The object of our Invention is to economise fuel, to promote the
circulation of the water in the boiler, and to save time in generating
steam. Our Invention is applicable to boilers in which internal flues are
employed, and it consists in placing coils of copper or other pipes in the
said internal flues; we place these coils at right angles or otherwise to
each other, so that they may intercept the products of combustion from
the fire-grate, and we prolong the ends of the coils nearest the bridge to

page_text: near the front end of the boiler to increase the circulation in the water.
Any convenient number of such coils of pipes are placed in the flue, and
the lower ends may be prolonged a certain distance towards the front for
increasing the circulation, we also apply one or more coils of pipes at the
end of the boiler to absorb the heat that would otherwise go off in the
flue.
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 5th September 1873.
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 Twenty-seventh day of March, in the year of
our Lord One thousand eight hundred and seventy-three, in the thirty-
sixth 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,
administrators, 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
"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,

page_text: and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement (that is
to say) :-
The object of our Invention is to ecomise fuel, to promote the
circulation of the water in the boiler, and to save time in generating
steam. Our Invention is applicable to boilers in which internal flues are
employed, and it consists in placing coils of copper or other pipes in the
said internal flues, we place these coils at right angles or otherwise to
each other, so that they may intercept the products of combustion from
the fire-grate, and we prolong the ends of the coils nearest the bridge to
near the front end of the boiler to increase the circulation in the water.
Any convenient number of such coils of pipes are placed in the flue, and
the lower ends may be prolonged a certain distance towards the front
for increasing the circulation, we also apply one or more coils of pipes
at the end of the boiler to absorb the heat that would otherwise go off
in the flue

page_text: flues, and the water circulates through them in the direction indicated
by the arrows.
Fig. 3 represents a modification of our Invention; in this case the
coils of pipes e are placed at right angles to each other, and the points
where the pipes enter and discharge are at the sides of the flues.
Fig. 4 represents another modification of our Invention; in this case
we place three coils of pipes vertically.
By means of these improvements a very considerable saving in fuel is
effected, the circulation of the water is increased, the liability to injury
owing to unequal expansion is reduced, the steam is rapidly generated,
the coils of pipes are self-cleaning, and the cost of application is very
small compared with the results.
Having thus stated the nature of our Invention, and described the
manner of performing the same, we wish it to be understood that we are
aware that coils of pipes have before been placed in the interior of the 1
flues of steam boilers, and Letters Patent were granted for the applica-
tion of such coils of pipes to steam boilers to John Addy Hopkinson on the
thirteenth day of November 1858, No. 2558, we therefore make no claim
to the coils of pipes in themselves, but we do claim the peculiar form of
coils, and the position of their connection with the top, bottom, and sides 2
of the flues, and the prolongations of the lower ends of the coils towards
the front of the boiler for equalising the temperature of the water in the
boiler.