IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS AND APPARATUS: CONNECTED THEREWITH
Year: 1867

page_text: LETTERS PATENT to Joshua Murgatroyd, of Heaton Norris, in the
County of Lancaster, Millwright and Engineer, for the Invention of
IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS AND APPARATUS:
CONNECTED THEREWITH."
PROVISIONAL SPECIFICATION left by the said Joshua Murgatroyd
at the Office of the Commissioners of Patents, with his Petition, on the
21st August 1867.
I, JOSHUA MURGATROYD, of Heaton Norris, in the County of Lancaster,
Millwright and Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS AND APPARATUS
CONNECTED THEREWITH," to be as follows:-
In constructing boilers having the fire-grate under a projecting end and the
roof of the fire place connected to the upper part of the casing of the boiler,"
or in other boilers having the fire-grate within the cylindrical casing, it is very*
desirable to form the roof. part over the fire so as to be self-cleaning, and also
that no rivets be exposed to the action of the fire. In order to effect these
objects I make, each plate of the whole length of the fire-box or roof part over
the fire and without any cross joints; these plates are fixed in an inclined
position. The longitudinal connections of these plates are secured' by rivets,
which are placed in the internal part of the boiler.
Another part of my Invention consists of an improved strengthening and
expanding ring for joining or connecting the plates or welded hoops of circular

page_text: or other shaped boiler flues. This ring is made of different sections of iron or
steel welded together, the upper part being hollow to allow for expanding and
the lower part T-shaped to prevent the accumulation of sediment.
My improvements in apparatus connected with boilers having the fire-grate
below a projecting end or within the cylindrical casing, and having two or
more flues, consists in the application of certain slides, doors, or dampers
placed at or near that end of the boiler which is furthest from the fire, which
slides, doors, or dampers are closed by a rod and levers or other equivalents
when the firing doors are opened to admit fuel to cause the current of smoke
and inflammable gases arising from that part of the fire-grate on which the
fresh coal has been thrown to pass over the incandescent part of the fire to
consume the sinoke rising from the coal that has been fresh supplied. These
doors or dampers are opened after the requisite time has elapsed to secure
combustion by the action of a regulator or by hand.
The regulator is a well-known instrument consisting of a tumbler weight
acting by suitable connections on the slide door or damper, which weight is
made to fall over after a given time by the flowing of water, mercury, or other
fluids from one end of a balanced arm to the other.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed"
by the said Joshua Murgatroyd in the Great Seal Patent Office on the
18th February 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSHUA
MURGATROYD, of Heaton Norris, in the County of Lancaster, Millwright and
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters:
Patent, bearing date the Twenty-first day of August, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirty-first year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Joshua Murgatroyd, Her special license, that I, the said Joshua
Murgatroyd, my executors, administrators, and assigns, or such others as I,
the said Joshua Murgatroyd, 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 "IMPROVE-
MENTS IN THE CONSTRUCTION OF STEAM BOILERS' AND APPARATUS CONNECTED

page_text: THEREWITH," upon the condition (amongst others) that I, the said Joshua
Murgatroyd, 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 Joshua Murgatroyd, 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 (that is to say):
In constructing boilers having the fire-grate under a projecting end and the
roof of the fire-place connected to the upper part of the casing of the boiler,
or in other boilers having the fire-grate within the cylindrical casing, it is very
desirable to form the roof part over the fire so as to be self-cleaning, and also
so that no rivets be exposed to the action of the fire. In order to effect these
objects I make each plate of the whole length of the fire-box or roof part over
the fire and without any cross joints; these plates are fixed in an inclined
position. The longitudinal connections of these plates are secured by rivets.
which are placed in the internal part of the boiler.
This part of my Invention is illustrated by Figures 1, 2, 3, and 4 of the
accompanying Sheet of Drawings. Figures 1 and 2 represent a longitudinal.
and transverse section of an ordinary two-flued cylindrical boiler to which my
improvements are applied. a is the outer casing of the boiler; b, b, the
internal flues; c, the grate bars, and d, the firing doors; these parts are made.
as usual. The fire box or roof over the fire consists of four or other convenient.
number of semicircular or other suitably curved plates e, each plate extending.
from the front of the boiler to the end of the flues 6; the plates e are placed.
in an inclined position and they are connected together, and the outer plates.
are connected to the shell of the boiler by rivets, the heads. of which come.
within the boiler and are consequently not exposed to the action of the fire.
The curved form of the plates e and their inclined. position prevent the
adhesion of sediment, consequently the roof of the fire box is self-cleaning.
The plates e are connected to the inside of the outer casing a by the stays or
stay plates ff. In Figures 3 and 4, I have shewn my improvements applied
to an ordinary multitubular boiler, and as all the parts in these views are
similar to those shewn in Figures 1 and 2 they are marked with corresponding
letters of reference.
Another
part of
my Invention consists of an improved strengthening and

page_text: expanding ring for joining or connecting the plates or welded hoops of circular
or other shaped boiler flues. This ring. is made of different sections of iron or
steel welded together, the upper part being hollow to allow for expanding, and
the lower part T-shaped to prevent the accumulation of sediment and to give
increased strength.
This part of my Invention is represented in Figures 5 and 6; in these views
b is part of the internal flue of a boiler, and g is my improved strengthening.
and expanding ring, the upper part of which is hollow like a bridge rail, as
shewn in Figure 5, to allow for expansion, and the lower part is T-shaped to
prevent the accumulation of sediment and to give strength. In making these
rings suitable lengths of a hollow rail and a T rail are bent to the proper
curve and then welded together at their ends, the increased width of the
hollow rail being tapered into the metal of the Trail, as shewn by.dotted lines
in Figure 5.
My improvements in apparatus connected with boilers having the fire-grates
below a projecting end, or within the cylindrical casing, and having two or
more flues, consist in the application of certain slides, doors, or dampers
placed at or near, that end of the boiler which is furthest from the fire, which
slides, doors, or dampers are closed by a rod and levers or other equivalents
when the firing doors are opened to admit fuel, to cause the current of smoke
and inflammable gases arising from that part of the fire-grate on which the
fresh fuel has been thrown to pass over the incandescent part of the fire to
consume the smoke or inflammable gases arising from the coal that has been
fresh supplied; these doors or dampers are opened after the requisite time has
elapsed to secure combustion by the action of a regulator or, by hand.
This part
of my
Invention is illustrated by Figures 7 and 8, which represent
part of an ordinary two-flued boiler with the firing doors and regulator in
combination with my improvements. a is the outer casing of the boiler; b, b,
the two flues; c, the fire-grate; d,,d, the firing doors, each of which acts on a
regulator when being opened and closed. To the hinge of the left-hand door
is fixed the rod i, the upper end of which is curved and acts on the balanced
arm h; each end of this arm is provided with a vessel k or k¹ containing water,
mercury, or other fluid, and the vessels k and k¹ are connected by the tubes
and m, the latter having a regulating tap as usual. To one end of the arm h
is fixed the chain u, which after passing over suitable guide pulleys p and q is
connected to the damper r of the right-hand flue 6. A similar regulator and
damper are applied to the right-hand door and to the left-hand flue. When
the door d'is opened to admit fuel the rod i causes the regulator to assume
the position.shewn in dotted lines in Figure 8, and the damper r is raised, the

page_text: Huid in the upper vessel k then passes rapidly through the tube 7 to the lower
vessel k¹, and the smoke and inflammable gases from the fresh fuel on the left-
band fire are conveyed over the incandescent fuel on the right-hand fire. In
shutting the door the rod i sets the regulator nearly horizontal, but sufficiently
inclined to allow the fluid to pass slowly through the pipe m from the vessel k¹ to the
vessel k, and when the preponderating weight of the balanced arm is sufficiently
great the parts of the regulator resume their original positions and the damper r
is closed. As the fires are fed alternately it is evident that the smoke and
inflammable gases from one fire are carried over a bright fire and are thus
consumed.
Having thus stated the nature of my Invention, and described the manner
of performing the same, I declare that I clain,--
First. The improved mode of constructing the roof of the fire-box of steam
boilers, as shewn and described.
Secondly. The placing the roof of the fire-box of steam boilers in an inclined
position, for the purposes described.
Thirdly. The improved mode of constructing rings for joining or connecting
the flues of steam boilers, as shewn and described.
And, lastly, the improved apparatus for regulating the draught through the
flues of steam boilers, as shewn and described.
In witness whereof, I, the said Joshua Murgatroyd, have hereto set
my hand and seal, this Thirteenth day of February, One thousand
eight hundred and sixty-eight.
JOSHUA MURGATROYD. (L.S.)