IMPROVEMENTS IN APPARATUs for RegulatING THE COMBUSTION IN STEAK BOILER FURNACES
Year: 1875

page_text: LETTERS PATENT to Samuel Madden, of Blenheim House, Heston,
in the County of Middlesex, Gentleman, for the Invention of
"IMPROVEMENTS IN APPARATUs for RegulatING THE COMBUSTION IN STEAK
BOILER FURNACES."
Sealed the 12th November 1875, and dated the 13th May 1875:
PROVISIONAL SPECIFICATION left by the said Samuel Madden at
the Office of the Commissioners of'Patents, with his Petition, on
the 13th May 1875.
.
I, SAMUEL MADDEN, of Blenheim House, Heston, in the County of
Middlesex, Gentleman, do hereby declare the nature of the said Inven-
tion for "IMPROVEMENTS IN APPARATUS FOR REGULATING THE COMBUSTION IN
STEAM BOILER FURNACES," to be as follows:-
My Invention consists in improved mechanical arrangements and the
application of improved simple compound or hollow dampers with
moveable plates attached, both of which have circular perforations or
vertical or horizontal slots at any convenient distance or diameter from
.

page_text: the centre, and are so fitted as to leave a constant annular space between
the flue and said dampers for the admission of a certain proportion of
air required for the more perfect combustion of the gases evolved from
the fuel on its passage from the furnace through the flues, fire-boxes,
and tubes.
These plain or hollow perforated dampers and back plates are manu-
factured in any shape or size, whole or in sections, to suit steam boiler
flues, or the smallest tubes, and are composed, one or both, of a fire-
resisting composition or plumbago, and where only one is so made the
other is made of metal.
The dampers, with perforated moveable plates, are attached to a singlo
cross bar for à double fluid boiler, or to suitable angle iron and cross
bars when there are a quantity of flues, as in marine and locomotive
boilers, the whole being worked from any convenient position in front
of the boiler to any area of opening by means of a hollow or solid con-
necting rod with a screw or lever motion as may be desired.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Samuel Madden in the Great Seal Patent Office
on the 13th November 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, SAMUEL
MADDEN, of Blenheim House, Heston, in the County of Middlesex,
Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirteenth day of May, in the year
of our Lord One thousand eight hundred and seventy-five, in the
thirty-eighth year of Her reign, did, for Herself, Her heirs and succes-
sors, give and grant unto me, the said Samuel Madden, Her special
licence that I, the said Samuel Madden, my executors, administrators,
and assigns, or such others as I, the said Samuel Madden, 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

page_text: "
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
Apparatus For REGULATING THE COMBUSTION IN STEAM BOILER FURNACES,” upon
the condition (amongst others) that I, the said Samuel Madden, 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 immediately
after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Samuel Madden, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement :-
My Invention consists in improved mechanical arrangements and the
application of improved simple compound or hollow damper with
moveable plates attached, both of which have circular perforations or
vertical or horizontal slots at any convenient distance or diameter from
the centre, and are so fitted as to leave a constant annular space between
the flue and said dampers for the admission of a certain proportion of
air required through and above the furnace bars for the more perfect
combustion of the gases evolved from the fuel on its passage from the
furnace through the flues, fire-boxes, and tubes.
These plain or hollow perforated dampers and back plates are manu-
factured in any shape or size, whole or in sections, to suit steam boiler
flues or the smallest tubes, and are composed, one or both, of a fire-
resisting composition or plumbago, and where only one is so made the
other is made of metal.
The dampers with perforated moveable plates are attached to a single
cross bar for a double flued boiler, or to suitable angle iron and cross
bars where there are a quantity of flues or tubes as in marine and loco-
motive boilers, the whole being worked from any convenient position in
front of the boiler to any area of opening by means of a hollow or solid
connecting rod with a screw or lever motion, as may be desired.
And in order that my said Invention may be properly understood and
readily carried into effect, I will proceed to describe the same with
reference to the annexed Drawing.

page_text: .
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side view of the boiler and Figure 2 a. front view, in
which a, a, are the dampers, and b, b, the moveable plates attached.
The dampers a, a, are worked by means of the lever c connected with
a rod d to the bell-crank lever e, which raises or lowers the dampers a, a, i
by means of the arm ƒ centred and working upon an arm g.
The moveable plates upon the dampers are worked by means of the
lever working the rod i and communicating the movement to the
wheelj, to which latter chains or rods O are attached, which raise or
lower the moveable plates which work in two slots k, k, through which 1
bolts 1, 7, pass to the outer face of the dampers a, a.
Figs. 3 and 4 shew a front and side view respectively of a boiler fitted
with an oval flue, to which dampers are fitted and worked as above
described.
Figure 5 shews a "breeches" piece of a." Galloway" boiler, m being 1
the flue end, and n the furnace end to which the dampers described above
may be fitted.
Having thus described the nature and object of my said Invention,
and the manner in which the same is or may be carried into effect, I
declare that what I claim and desire to be secured to me by the herein- 2
before in part recited Letters Patent is, the improved mechanical
arrangements and the application of improved simple compound or
hollow dampers with moveable plates attached for regulating the com-
bustion in steam boiler furnaces, substantially as herein-before described
and shewn on the Drawings, or any mere modification thereof.
In witness whereof, I, the said Samuel Madden, have hereunto
set my hand and seal, this Twelfth day of November, in the
year of our Lord One thousand eight hundred and seventy-.
five.
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