AN IMPROVED METHOD OP AND APPARATUS FOR APPLYING HEATED AIR TO ECONOMIZE THE HEAT THE OF STEAM BOILER AND OTHER FURNACES, AND FOR SIMILAR PURPOSES
Year: 1872

page_text: LETTERS PATENT to George Harrison Bolton, of Widnes, in the
County of Lancaster, for the Invention of "AN IMPROVED METHOD
OP AND APPARATUS FOR APPLYING HEATED AIR TO ECONOMIZE THE HEAT OF
Sealed the 25th April 1873, and dated the 1st November 1872.
PROVISIONAL SPECIFICATION left by the said George Harrison Bolton
at the Office of the Commissioners of Patents, with his Petition,
on the 1st November 1872.
I, GEORGE HARRISON BOLTON, of Widnes, in the County of Lancaster,
do hereby declare the nature of the said Invention for "AN IMPROVED
METHOD OF AND APPARATUS FOR APPLYING HEATED AIR TO ECONOMIZE THE HEAT
OF STEAM BOILER AND OTHER FURNACES, AND FOR SIMILAR PURPOSES," to be as
follows :-
My said Invention relates to a novel method of and apparatus for
economizing the heat in steam boiler and other furnaces, or in flues or
other structures for generating or conducting heat.

page_text: In applying my said Invention to the furnace of a Cornish or similar
boiler I place in the flue tube or flue tubes behind the furnace a pipe or
tube opening into the ash-pit below the bridge, and extending therefrom
through and beyond the flue and the brickwork at the rear of the boiler,
its outer end opening into the atmosphere. Or the said pipe may be
extended through one of the flues at the sides or bottom of the boiler, or
may be placed outside but in close proximity to the said flue. And in
cases where a large heating surface is necessary or desirable the said pipe
may be made to pass through the flue tube as first described and return
through the side or bottom flue into the external atmosphere at the front
of the boiler.
A current of air produced by a fan or otherwise is forced or drawn
through these tubes or pipes into the ash-pit whence it passes up between
the fire-bars into and over the burning fuel, being thereby heated before
it passes onward into the flues.
If desired instead of carrying the air pipe through the bridge into the
ash-pit I may terminate it behind the same so that the air passing through
the said pipe will escape therefrom into the flue behind the furnace and
will be mingled therein with the hot gases resulting from the combus-
tion of the fuel in the furnace. The front of the ash-pit is closed by a
tight door to prevent any entrance of air except through the aforesaid
pipe or pipes.
By the use of this Invention I keep the flame and heated products of
combustion in the furnace or flues in close contact with the surfaces to
be heated.
The said Invention may be applied to all kinds of steam boiler
furnaces, and to other furnaces wherein it. is practicable to arrange. a
pipe or pipes for introducing the air as above, described. It may also be
applied to evaporating apparatus and to many other like uses.
SPECIFICATION, in pursuance of the conditions of the. Letters. Patent,
filed by the said George Harrison: Bolton, in the Great Seal. Patent.
Office on the 30th April 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
HARRISON BOLTON, of Widnes, in the County of Lancaster, send
greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the First day of November, in the year of
our Lord One thousand eight hundred and seventy-two, in the thirty-sixth
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said George Harrison Bolton, Her special licence
that I, the said George Harrison Bolton, my executors, administrators,
and assigns, or such others as I, the said George Harrison Bolton, 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
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 "AN IMPROVED
METHOD OF AND APPARATUS FOR APPLYING HEATED AIR TO ECONOMIZE THE HEAT
OF STEAM BOILER AND OTHER FURNACES, AND FOR SIMILAR PURPOSES," upon the
condition (amongst others) that I, the said George Harrison Bolton,
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 immc-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said George Harrison Bolton, 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, reference being had to the accompanying
Drawing forming a part of this Specification.
My said Invention relates to a novel method of and apparatus for
economizing the heat in steam boiler and other furnaces, or in flues or
other structures for generating or conducting heat.
In applying my said Invention to the furnace of a "Cornish " or similar
boiler I place in the flue tube or tubes behind the furnace a pipe or tube
opening into the ash-pit below the bridge, and extending therefrom
through and beyond the flue and the brickwork at the rear of the boiler,
its outer end opening into the atmosphere. Or the said pipe may be
extended through one of the flues at the sides or bottom of the boiler,
or may be passed outside but in close proximity to the same. And in
cases where a large heating surface is necessary or desirable the said

page_text: pipe may be made to pass through the flue tube as first described, and
return through the side or bottom flues into the external atmosphere at
the front of the boiler.
The said Invention may be applied to all kinds of steam boiler
furnaces, and to other furnaces where it is practicable to arrange a pipe
or pipes for introducing the air as above described.
applied to evaporating apparatus and to many other like uses.
It may also be
In the accompanying Drawing I have illustrated its application to the
furnaces of an ordinary double-flued steam boiler.
Figures 1 and 2 are longitudinal and transverse vertical sections of
the said boiler. Figure 1 is taken on the line x, x, Figure 2, and
Figure 2 is taken on the line y, y, Figure 1. Like letters indicate the
same parts in both of the Figures.
a is the shell of the said boiler; b, b, are the flue tubes fitted in the
same in the ordinary manner; c is the furnace or fire-place of the tube
shown in Figure 1, and d is the ash-pit which has tight doors
at c¹; e, f, g, are external flues formed in the brickwork setting of the
boiler.
As will be seen in the Drawing my said apparatus is exceedingly
simple and does not require any alteration of the boiler or its flues;
h, h, are the aforesaid air pipes or tubes which have inlet openings at h¹
whereby air can enter the ash-pits.
A current of air is drawn or may be forced through these tubes or
pipes into the ash-pits, and being thereby heated passes onward into,
through, and over the burning fuel. The front of the ash-pits being
closed by tight doors as above described to prevent any entrance of air
except through the aforesaid pipes.
If desired instead of carrying the air pipe or pipes through the bridge
into the ash-pit I may terminate it behind the same so that the air
passing through the said pipe or pipes will escape into the flue behind
the furnace and will be mingled therein with the hot gases resulting from
the combustion of the fuel in the furnace.
By the use of this Invention I keep the flame and heated products of
combustion in the furnace or flues in close contact with the surfaces to
be heated.

page_text: Having thus described the said Invention, and the manner of per-
forming the same, I wish it understood that I claim the herein-described
improved method of applying and utilizing heated air for economizing
heat in steam boiler and other furnaces, and for other like purposes by
means of the apparatus above described, or other suitable apparatus.
In witness whereof, I, the said George Harrison Bolton, have
hereunto set my hand and seal, this Twenty-ninth day of April
in the year of our Lord One thousand eight hundred and seventy-
three.