IMPROVEMENTS IN THE CON- STRUCTION OF STEAM BOILERS
Year: 1876

page_text: LETTERS PATENT to Thomas Williams and John Pemberton, both of Manchester,
in the County of Lancaster, for the Invention of "IMPROVEMENTS IN THE CON-
STRUCTION OF STEAM BOILERS."
Sealed the 16th September 1876, and dated the 7th July 1876.
PROVISIONAL SPECIFICATION left by the said Thomas Williams and John
Pemberton at the Office of the Commissioners of Patents on the 7th July 1876.
THOMAS WILLIAMS and JOHN PEMBERTON, both of Manchester, in the County of
Lancaster. "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS."
This Invention is applicable principally to that class of steam boilers commonly
known by the name of "Galloway" boilers, but it may also be adapted with
advantage to " Cornish," vertical, and other boilers where what are called "side
pockets" are used..
The great advantage of these "side pockets" in preventing smoke and more
perfectly distributing the heated gases amongst the water tubes are well known,
but they have at the same time the counterbalancing defects that they considerably
weaken the boiler at this part, and also prevent the access of the heated gases and
flames to that part of the heating surface of the flue immediately behind them.
Our Invention is intended to remedy these defects, at the same time that all the
advantages of the "side pockets" are not only retained but increased, and consists
in carrying a tube or tubes (either of a cylindrical, conical, or other suitable section)
through the "side pockets" in a direction parallel to the flue. These tubes are
made with flanges at each end, and are rivetted to the walls of the "pockets" and
acting as fire tubes give an increased heating surface. At the same it will be
evident that they act as hollow stays and give an increased strength and rigidity
to the boiler, and being open all through they allow a certain portion of the heated
gases and flame to pass through and impinge against the internal surface of the
fiue immediately behind the "pockets."
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Williams and John Pemberton in the Great Seal Patent
Office on the 6th January 1877.
THOMAS WILLIAMS and JOHN PEMBERTON, both of Manchester, in the County of
Lancaster. "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS."
This Invention is applicable principally to that class of steam boilers commonly
known by the name of "Galloway" boilers, but it may also be adapted with
[Price 4d1

page_text: "
advantage to Cornish,"
65
vertical," and other boilers where what are called
"
side pockets" are used.
The great advantage of these. "side pockets in preventing smoke and more
perfectly distributing the heated gases amongst the water tubes are well known,
but they have at the same time the counterbalancing defects that they considerably
weaken the boiler at this part and also prevent the access of the heated gases and
flames to that part of the heating surface of the flue immediately behind them.
Our Invention intended to remedy these defects, at the same time that all the
advantages of the "side pockets" are not only retained but increased, and consists
in carrying a tube or tubes (either of a cylindrical, conical, or other suitable section)
through the "side pockets" in a direction parallel to the flue. These tubes are
made with flanges at each end and are rivetted to the walls of the "pockets," and
acting as fire tubes give an increased heating surface. At the same time it will be
evident that they act as hollow stays and give an increased strength and rigidity
to the boiler, and being open all through they allow a certain portion of the heated
gases and flame to pass through and impinge against the internal surface of the flue
immediately behind the "pockets."
Such being the nature and object of our said Invention, we will now proceed to
describe more in detail the manner in which the same is to be or may be performed
or carried into practical effect, and in order that the same may be clearly under-
stood 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 and Fig. 2 a plan view
of a "
Galloway" boiler with our improvements shown as applied thereto.
a, a, is the shell of the boiler; b, b, the fluc; and c, c, the Galloway tubes; d, d,
are the side pockets. Each pocket has a horizontal tube e, e, carried through it in a
direction parallel to the flue, the said tube being provided with a flange at each
end by which it is rivetted to the walls of the pocket (see enlarged plan view
Fig. 3, and face view Fig. 4), and it will be evident that these tubes will both serve
as fire tubes so as to increase the heating surface, and also as hollow stays so as to
give increased strength and rigidity to the boiler; more than one tube may be
fitted to each pocket if preferred.
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,
inserting in the side pockets of "Galloway" and other boilers horizontal tubes
(either cylindrical, conical, or of other convenient form) rivetted to the walls of
the pockets by means of flanges so as to act as stays thereto, and open from end
to end so as to act as fire tubes, substantially as herein-before described.
In witness whereof, we, the said Thomas Williams and John Pemberton, have
hereunto set our hands and scals, this Fifth day of January, in the year of
our Lord One thousand cight hundred and seventy-seven.
THOMAS WILLIAMS. (L.S.)
JOHN PEMBERTON.
(L.S.)