IMPROVEMENTS IN STEAM BOILERS
Year: 1870

page_text: LETTERS PATENT to William Arnold, of Barnsley, in the County
of York, Engineer, and William Carnelley, of Manchester, in
the County of Lancaster, Warehouseman, for the Invention of
Sealed the 22nd November 1870, and dated the 26th May 1870.
PROVISIONAL SPECIFICATION left by the said William Arnold and
William Carnelley at the Office of the Commissioners of Patents,
with their Petition, on the 26th May 1870.
We, WILLIAM ARNOLD, of Barnsley, in the County of York, Engineer,
and WILLIAM CARNELLEY, of Manchester, in the County of Lancaster,
Warehouseman, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN STEAM BOILERS," to be as follows:-
Our Invention consists in an arrangement of steam boiler, whereby
the products of combustion are arrested at the usual position of the
bridge and are diverted so as to pass transversely into a combustion

page_text: chamber beneath the outer shell of the boiler. For this purpose we
form a water space stop at the back of the furnace and openings at the
sides thereof, through which the products of combustion are obliged to
pass, and at which we propose to introduce air. From these openings
the said products are conducted to a chamber beneath that part of the
outer shell which is below the fire-bars, where the smoke is burnt and
flue dust is deposited. After this they pass through openings behind
the aforesaid water space stop and into a chamber or chambers
within the boiler, and which may be like ordinary flues, but we pro-
pose to provide the said chamber with tubes vertically or otherwise
disposed.
Our Invention may be adapted to any suitable known description of
boiler and with one or more separated sets of fire-bars; if with more
than one we propose to fit dampers to the aforesaid openings so as to
work them alternately as in known alternate firing systems.
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said William Arnold and William Carnelley in the Great
Seal Patent Office on the 26th November 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
ARNOLD, of Barnsley, in the County of York, Engineer, and WILLIAM 2
CARNELLEY, of Manchester, in the County of Lancaster, Warehouseman,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-sixth day of May, in the year of
our Lord One thousand eight hundred and seventy, in the thirty- 2
third year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said William Arnold and William Carnelley,
Her special license that we, the said William Arnold and William
Carnelley, our executors, administrators, and assigns, or such others as
we, the said William Arnold and William Carnelley, our executors, g
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,

page_text: will at present assume that the known principle of alternate firing is
adopted. Supposing the fire-place 6 to contain fuel in an incandescent
state, and the other C to have been just fed, the smoke arising from the
latter will be drawn by the former through the communication r so as to
pass over the heated mass in 6 where it is for the greater part consumed.
From thence the products of combustion will pass through the lateral
flue into the space i and afterwards partly through the pigeon holes k
and partly through the aperture /* into the combustion chamber e which
is situate at the front end of the boiler. Here the direct draft is inter-
cepted by the wall 7, and the brickwork j, k, having become red hot the
smoke which is broken up in its passage through the pigeon holes is
further consumed and the flue dust is deposited at the bottom of the
chamber e and may be removed when desired through the door z. The
products of combustion being arrested in their direct course by the wall
pass upward through the opening m into the chamber n, in traversing
which they flow in contact with the tubes o, p, and afterwards proceed
into the main flue q beneath the boiler, from whence they are discharged
through the openings y into side flues s, t, which lead to the chimney u,
all of which currents are shewn by the arrows on the Drawings. When
the firing takes place in the other fire-place 6 the course of the products
of combustion will of course be reversed, those from the green fuel
passing over the heated mass at c through the space h and from thence
through the pigeon holes ; and passage j* into the chamber e, and are
then carried to the chimney as before.
We have above alluded to our Invention as connected with the system
of alternate firing, but if desired the said firing may be in any other order,
and in the case of the said alternate firing we adapt dampers as shewn
at w, x, which dampers may be employed for securing the passage of
smoke from the green fuel to that which is highly heated.
We have also alluded to a certain description of boiler and to details
thereof but we do not confine ourselves thereto, that which we claim as
secured to us under the above in part recited Letters Patent being, dis-
pensing with the usual bridge and using in place thereof a water spaced
stop, and in conjunction therewith the lateral flues leading to a com-
bustion chamber situate beneath the fire-bars and prevented as at / from

page_text: Also taking the products of combustion upward from the said com-
bustion chamber into an interior chamber of the boiler, as at m, n.
Also the dampers w, x, as shewn and described.
In witness whereof, I, the said William Carnelley, have hereunto
set my hand and seal, this Twenty-fifth day of November, in
the year of our Lord One thousand eight hundred and seventy.