IMPROVEMENTS IN STEAM BOILERS
Year: 1873

page_text: LETTERS PATENT to Eli Heyworth, Manufacturer, of Blackburn, in
the County of Lancaster, and Nathan Wilkinson, of the same
Place, Manager, for the Invention of "IMPROVEMENTS IN STEAM
BOILERS."
COMPLETE SPECIFICATION filed by the said Eli Heyworth and Nathan
Wilkinson at the Office of the Commissioners of Patents, with their
Petition and Declaration, on the 26th May 1873, pursuant to the
9th Section of the Patent Law Amendment Act, 1852.
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 we are in possession of an Invention for "IMPROVEMENTS
IN STEAM BOILERS," and have petitioned Her Majesty to grant unto our
executors, administrators, and assigns, Her Royal Letters Patent for the
same, and have made solemn Declaration that we are the first and
true Inventors thereof.

page_text: NOW KNOW YE, that we, the said Eli Heyworth and Nathan
Wilkinson, do hereby declare that the following Complete Specifi-
cation, under our hands and seals, fully describes and ascertains the
nature of the said Invention, and in what manner the same is to be
performed, in and by the following statement :--
Our Invention relates to improvements in the cross tubes of steam
boilers, either of the form described, we believe, in the Specification of a
Patent granted to William Galloway and John Galloway, on the
Twenty-first day of June, One thousand eight hundred and fifty-three, or
to any other form of tube crossing the internal flues of steam boilers.
The object of our Invention is to economize fuel and promote the
circulation of the water in the boiler. We accomplish this by con-
necting to the tube or tubes, of whatever form or construction, a pipe
continued to a convenient distance from the bottom of the boiler, and
the continuation of such pipes connected to the tubes immediately
behind the bridge, in varying lengths, towards the front end of the
boiler under the furnace, which is the portion of the boiler in which the
least circulation of water takes place.
It is well known that you can have a pressure of fifty pounds on the
square inch, representing a temperature of about two hundred and
ninety-eight degrees "Fahrenheit," above the water line in a Lancashire
boiler when the temperature of the water immediately to the front and
under the grate bars is not more than eighty degrees Fahrenheit. These
unequal temperatures occasion great strains upon the boiler by unequal
expansion and contraction causing the shell of the boiler to crack, and
the angle iron of the flues to break. Our improvements are partly to
remedy these evils and also to promote the circulation of the water,
thus generating more steam and effecting a considerable saving in fuel
consumption.
We will now describe the Drawings herewith annexed and forming
part of this Specification.
DESCRIPTION OF DRAWINGS.
Fig. 1 shews a longitudinal section of a two-flue Lancashire boiler;
the Aue into which the tube8 and fixed. these tubos

page_text: forward towards the front end of the boiler under the furnace; C, D,
and E, are also connecting pipes in varying lengths, and inclining
towards the front end of the boiler; F, F, F, shew the connecting pipes
brought down to a convenient distance from the boiler bottom.
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moting pipes in varying lengths, and inclining
towards the front end of the boiler; F, F, F, shew the connecting pipes
brought down to a convenient distance from the boiler bottom.
Fig. 2 is a cross section shewing connecting pipes G, G, G.
Fig. 3 is a cross section of a Galloway boiler, shewing our improved
connecting pipe applied to those tubes.
Fig. 4 is also a cross section, shewing our improved circulating pipes
connected to parallel tubes placed vertically and diagonally.
Having thus described and ascertained the nature of our said
Invention and the manner in which the same is to be performed, we
desire it to be understood that we claim,-
Firstly. An improved circulation of water and a saving of fuel by
increased generation of steam by means of the connecting pipe.
Secondly. The equalization of temperatures in the boiler, causing
more equal expansion, and thus adding to the safety and durability of
steam boilers; this is also accomplished by our improved connecting
pipe.
In witness whereof, we, the said Eli Heyworth and Nathan Wilkin-
son, have hereunto set our hands and seals, this Twenty-third day
of May, in the year of our Lord One thousand eight hundred
and seventy-three.
Witness,
WILLIAM HOYLE.
ELI HEYWORTH.
(L.S.)
NATHAN WILKINSON.
(L.S.)