IMPROVEMENTS IN THE FLUES
Year: 1873

page_text: LETTERS PATENT to Richard Harwood, George Harwood, John
Scholes, and Thomas Seymour, all of Bolton, in the County of
Lancaster, for the Invention of "IMPROVEMENTS IN THE FLUES OF
Sealed the 9th September 1873, and dated the 16th July 1873.
PROVISIONAL SPECIFICATION left by the said Richard Harwood,
George Harwood, John Scholes, and Thomas Seymour at the Office
of the Commissioners of Patents, with their Petition, on the 16th
July 1873.
We, RICHARD HARWOOD, GEORGE HARWOOD, JOHN SCHOLES, and
THOMAS SEYMOUR, all of Bolton, in the County of Lancaster, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN THE FLUES
OF STEAM BOILERS FOR EFFECTING THE ECONOMY OF FUEL," to be as follows:-
:-
The object of this Invention is to economize the consumption of fuel
in the furnaces of steam boilers and to obtain the greatest amount of
heating effect therefrom by causing the flame and heat from the furnace
to spread all round the surface of the internal fluc, and thus to utilize

page_text: the greatest amount of heating surface possible in any given size of
flue.
Our Invention consists in placing in any part of the internal flue of
the boiler, whether close to the furnace in place of a bridge or at the
other end, or in any part of the flue, a wad or stop made of fire-brick,
fire-clay, cast iron, or any other material or materials, such wads or stops
being of smaller diameter than the internal diameter of the flue, whereby
the flame and heat are compelled to divide and spread out into a tubular
form, and thus pass along in contact with the whole of the interior
surface of the flue, and by these means the whole of the surface of the
flue in contact with the water in the boiler becomes utilized as heating
surface, and consequently the maximum heating effect is obtained in
proportion to the quantity of fuel consumed.
Our Invention comprises all such wads of whatever size or shape,
whose object is to direct the heat round the surface of the flue wherever
these wads are placed (including their substitution for ordinary bridges)
and whatever be their number; and also whether they are replaced by
any solid material or pipe, filled with water or not, stretching through
the flue so as to leave a tubular flame space.
Also our Invention includes all modifications in which these wads
(whether by being made to swivel or in any other manner), shall be used
as dampers, including all cases in which such dampers are of the same
size as the fluc, provided their object be to direct the heat to the surface
of the flue. By allowing between these wads and the surface of the
flue a similar area to that which exists between the bridge at the end of
the furnace and the flue we secure that these wads will not impede the
draught, and thus the principle can be applied to any boiler without
injury to the draught.
filed by the said Richard Harwood, George Harwood, John Scholes,
and Thomas Seymour in the Great Seal Patent Office on the 15th
January 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, RICHARD
HARWOOD, GEORGE HARWOOD, JOHN SCHOLES, and THOMAS SEYMOUR,
all of Bolton, in the County of Lancaster, send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixteenth day of July, 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 suc-
cessors, give and grant unto us, the said Richard Harwood, George
Harwood, John Scholes, and Thomas Seymour, Her special license that
we, the said Richard Harwood, George Harwood, John Scholes, and
Thomas Seymour, our executors, administrators, and assigns, or such
others as we, the said Richard Harwood, George Harwood, John Scholes,
and Thomas Seymour, 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 THE FLUES OF STEAM BOILERS FOR EFFECTING
THE ECONOMY OF FUEL," upon the condition (amongst others) that
we, the said
Richard Harwood, George Harwood, John Scholes, and Thomas Seymour,
our executors or administrators, by an instrument in writing under our,
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 we, the said Richard Harwood, George Harwood,
John Scholes, and Thomas Seymour, 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 state-
ment and accompanying Drawing (that is to say) :—
The object of this Invention is to economize the consumption of fuel
in the furnaces of steam boilers and to obtain the greatest amount of
heating effect therefrom by causing the flame and heat from the furnace
to spread all round the surface of the internal flue, and thus to utilize
the greatest amount of heating surface possible in any given size of
flue.
Our Invention consists in placing in any part of the internal flue of
the boiler, whether close to the furnace in place of a bridge or at the
other end, or in any part of the flue, a wad or stop made of fire-brick,
fire-clay, cast iron, or any other material or materials, such wads or stops.

page_text: being of smäller diameter than the internal diameter of tlie flue, whereby
the flame and heat are compelled to divide and spread out into a tubular
form, and thus pass along in contact with the whole of the interior
surface of the flue, and by these means the whole of the surface of the
flue in contact with the water in the boiler becomes utilized as heating
surface, and consequently the maximum heating effect is obtained in
proportion to the quantity of fuel consumed.
Our Invention comprises all such wads of whatever size or shape
whose object is to direct the heat round the surface of the flue wherever
these wads are placed (including their substitution for ordinary bridges)
and whatever be their number; and also whether they are replaced by
any solid material or pipe, filled with water or not, stretching through
the flue so as to leave a tubular flame space.
Also our Invention includes all modifications in which these wads
(whether by being made to swivel or in any other manner) shall be used
as dampers, including all cases in which such dampers are of the same
size as the flue, provided their object be to direct the heat to the surface
of the flue. By allowing between these wads and the surface of the
flúe a similar area to that which exists between the bridge at the end of
the furnace and the flue we secure that these wads will not impede the
draught, and thus the principle can be applied to any boiler without
injury to the draught.
19
Such being the nature and object of our said Invention for "Improve-
ments in the Flues of Steam Boilers for Effecting the Economy of Fuel,'
in order that the same may be more clearly understood we have annexed
hereunto a Sheet of Drawings illustrative thereof, and have marked the
same with figures and letters of reference corresponding with those in
the following explanation thereof :—
In the annexed Drawing Fig. 1 is a transverse section of a boiler flue
a, a, showing the application of a fixed cast-iron wad or stop b, b, cast
in two pieces and supported on three feet or brackets c, c, c. Fig. 2 is a
vertical section, and Fig. 3 a plan view of the same. Figs. 4, 5, and 6 are
similar views of a swivelling wad or stop, which may be opened or closed
more or less by means of the long rod or handle d, d. The wad or stop
b, b; is mounted on the vertical spindle d, d, which is supported on the
bracket or foot plate e, e, beneath, and the plate c, c, abovė,

page_text: Having now described the nature and object of our said Invention,
together with the manner in which the same is to be or may be performed
or carried into practical effect, we wish it to be understood that we claim
as our Invention placing the wad, disc, or stop (or more than one) in a
boiler flue for the purpose of causing the flame and heat therein to
spread all round the surface of the said flue, and thus to utilize the
greatest amount possible of heating surface, such wads, discs, or stops
being either fixed or made to swivel either perpendicularly, horizontally,
or otherwise, substantially in the manner and for the purposes herein-
before set forth.
In witness whereof, we, the said Richard Harwood, George Har-
wood, John Scholes, and Thomas Seymour, have hereunto set our
hands and seals this Thirteenth day of January. in in the year of