IMPROVEMENTS IN APPARATUS FOR REGULATING THE DAMPERS OF STEAM-BOILER AND OTHER EVAPORATING FURNACES, WHICH APPARATUS IS ALSO APPLICABLE FOR IN- DICATING THE PRESSURE OF STEAM OR OTHER FLUIDS
Year: 1852

page_text: LETTERS PATENT to Thomas Walker, of Birmingham, in the
County of Warwick, for the Invention of "IMPROVEMENTS IN
APPARATUS FOR REGULATING THE DAMPERS OF STEAM-BOILER AND OTHER
EVAPORATING FURNACES, WHICH APPARATUS IS ALSO APPLICABLE FOR IN-
DICATING THE PRESSURE OF STEAM OR OTHER FLUIDS."
Scaled the 31st May 1853, and dated the 30th December 1852.
PROVISIONAL SPECIFICATION left by the said Thomas Walker
at the Office of the Commissioners of Patents, with his Petition,
on the 30th December 1852.
I, THOMAS WALKER, of Birmingham, in the Cy. of Warwick,
do hereby declare the nature of the said Invention for "IMPROVE.
MENTS IN APPARATUS FOR REGULATING THE DAMPERS OF STEAM BOILER AND
OTHER EVAPORATING FURNACES, WHICH APPARATUS IS ALSO APPLICABLE FOR IN-
DICATING THE PRESSURE OF STEAM OR OTHER FLUIDS," to be as follows:-
The Invention consists in causing the steam to act in a cylinder
against a piston, the stem or rod of which is by suitable means con-
nected to an axis with a capability of causing that axis to rotate or

page_text: partially so, as the pressure of steam noves the piston. To this axis,
or one geared with it, is connected a weighted lever, which up to
any given pressure hangs vertically; but, as the pressure of steam
increases, the weighted lever is caused to move towards a horizontal
position. A spring may be used in place of the weight. This
apparatus is by suitable mechanism connected to the damper, so
that, as the pressure of steam increases beyond any desired point,
the damper may be more or less closed.
If a dial plate be affixed to apparatus such as above described,
and a pointer to the rotating axis, it may be used to indicate the
pressure of steam or other fluid admitted to the cylinder.
SPECIFICATION in pursuance of the conditions of the Letters
Patent, filed by the said Thomas Walker in the Great Seal
Patent Office on the 30th June 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
THOMAS WALKER, of Birmingham, in the County of Warwick, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirtieth day of December, in the
year of our Lord One thousand eight hundred and fifty-two, in the
sixteenth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Thomas Walker, Her
special licence that I, the said Thomas Walker, my executors,
administrators, and assigns, or such others as I, the said Thomas
Walker, 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 "IMPROVEMENTS IN APPARATUS FOR REGULATING THE
DAMPERS OF STEAM BOILER AND OTHER EVAPORATING FURNACES, WHICH
APPARATUS IS ALSO APPLICABLE FOR INDICATING THE PRESSURE OF STEAM

page_text: OR OTHER FLUIDS," upon the condition (amongst others) that I,
the said Thomas Walker, by an instrument in writing under my
hand and seal, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to
be performed, and cause the samne 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 Thomas Walker, 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 thereof (that is to say):
1.
My Invention consists in causing the pressure of steam from a
steain boiler or other evaporating furnace to act in a cylinder upon
piston weighted, so that the piston is caused to traverse in its
cylinder only as the pressure of the steam encrcases, and in that
traverse to act upon the damper, to regulate the draft through the
furnace, and its consequent evaporating effect, and also in causing
the pressure of steam or of other fluid for the time exerted to be
indicated.
In order that the Invention may be fully understood, I will proceed
to describe the means pursued by me.
DESCRIPTION OF THE DRAWING.
Figure 1, shows a perspective view, Figure 2, a sectional view, and
Figure 3, a plan of apparatus according to my Invention. a, is a
steam pipe from a boiler or other evaporating furnace, and b, is the
cylinder in which the steam is caused to act upon water produced
by condensation; c, is the piston, and d, the piston rod; the upper
end of which is connected by means of the chain or band e, to the
segment (or it may be a wheel), affixed to the axis g; to which
is also affixed the weighted lever arm h, and the wheel i. The
amount of pressure on the piston c, may be regulated by varying
the position of the weight h', on the lever h. And supposing the
steam now to be acting with the parts in the position indicated by
the Drawing, when the pressure encreases the piston will be elevated,.

page_text: raising the weighted end of the lever to the horizontal line indicated
by dotted lines, and give partial rotary motion to the wheel i; to the
periphery of which is affixed the chain or band j, one end of which
supports the damper k, and the other the counterbalance weight
k', so that when the piston is raised by the pressure of steam, and
the wheel, has partial rotary motion given to it in the direction of
the arrow, the damper will be caused more or less to close the fluc,
and thereby check the draft and consequent evaporation according
to the pressure exerted over that determined upon, by the weight-
ing of the lever h, as the ordinary pressure to be exerted; i, is an
adjusting screw to regulate the position of the chain j, on the wheel
i; a', is a tap to admit the steam.
Figure 4, shows a side view, partly in section; Figure 5, a front
view; and Figure 6, a plan, of a modification of the above apparatus;
the principle difference, in this case, being that the pressure of a
spring is used to act upon the piston in place of the weight, and a
pointer is applied to indicate the pressure exerted in the cylinder;
similar letters are used to indicate like parts in this case to those
previously described. Upon the arm h, is affixed the arc h¹, with
its balance weight ³; the spring ², acts on the arc h¹, or a weighted
lever may in this case be used, as shown by dotted lines in place of
the spring. The arc may carry a pointer which, in the elevation of
the piston, is caused to traverse the graduated quadrant 2, and
thereby indicate the pressure of the steam exerted upon the piston.
That pressure being in each case regulated by the strength of the
spring 2, used. In this case I have shewn another arrangement of
damper on the principle of a throttle valve.
The apparatus just described may also be used simply to indicate
the pressure of steam or other fluid admitted by a pipe a, to act
upon the piston, the apparatus at the same time acting or not upon
a damper; and it is this adaptation which constitutes one part of
my Invention.
Having thus described the nature of my said Invention, I would
have it understood that I do not confine myself to the precise details
herein shown and described, so long as the peculiar character thereof

page_text: be retained; but what I claim is, the means herein described for
actuating the dampers of steam boiler and other evaporating
furnaces; and also I claim the application of the apparatus herein
described to indicate pressure of steam or other fluids.
In witness whereof, I, the said Thomas Walker, have hereunto
set my hand and seal, this Thirtieth day of June, in the
year of our Lord One thousand eight hundred and fifty-
three
Witness,
WILLIAM BROOKES,
73, Chancery Lanc.
THOS. WALKER. (L.S.)