IMPROVEMENTS IN STEAM BOLLER AND OTHER FURNACES
Year: 1867

page_text: LETTERS PATENT to Humphrey Chamberlain, of Wakefield, in the
County of York, Engineer, for the Invention of "IMPROVEMENTS IN
STEAM BOLLER AND OTHER FURNACES."
Sealed the 12th November 1867, and dated the 20th May 1867.
PROVISIONAL SPECIFICATION left by the said Humphrey Chamberlain
at the Office of the Commissioners of Patents, with his Petition, on
the 20th May 1867.
I, HUMPHREY CHAMBERLAIN, of Wakefield, in the County of York, Engineer,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
STEAM BOILER AND OTHER FURNACES," to be as follows:-
This Invention relates to an improved mode of applying and economizing
the heat of steam boiler and other furnaces, and consists in storing or
magazining a large proportion of the heat which has hitherto been lost or
wasted by being carried by the draught up the chimney before it has had
sufficient time to become absorbed by the boiler plates or other surface to be
heated.
According to this Invention, as applied to marine and Cornish boilers, for
example, it is proposed to pack or fill in the flue behind the furnace or fire-
bridge with open brickwork of fire-brick, fire-tiles, or fire-clay lumps, the
interstices being so disposed as to sift the current of hot air without stopping
the draught. By this means the heat which is not immediately taken up by
the plates is stored in or collected by the fire-bricks, whence it radiates off to

page_text: the boiler plates. These fire-bricks soon attain a very elevated temperature
throughout the entire portion or length of the flue in which they are placed,
and impart a more uniform degree of heat throughout the length of such flue.
An additional supply of air may with this arrangement be admitted to the
fuel above the grate, and hence a 'more perfect combustion is obtained, and
the prevention of smoke effected with a corresponding economy of fuel.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Humphrey Chamberlain in the Great Seal Patent Office
on the 20th November 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HUMPHREY
CHAMBERLAIN, of Wakefield, in the County of York, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twentieth day of May, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Humphrey Chamberlain, Her special license that I, the said
Humphrey Chamberlain, my executors, administrators, and assigns, or such
others as I, the said Humphrey Chamberlain, my executors, administrators,
or 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 STEAM BOILER AND OTHER FURNACES," upon
the condition (amongst others) that I, the said Humphrey Chamberlain, my
executors or administrators, 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 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 Humphrey Chamberlain, 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, reference being had to the accompanying Drawings, and
to the letters and figures marked thercon, that is to say :-

page_text: My said Invention relates to an improved mode of applying and economising
the heat of steam boiler and other furnaces, and consists in storing or
magazining a large proportion of the heat which has hitherto been lost or
wasted by being carried by the draught up the chimney before it has had
sufficient time to become absorbed by the boiler plates or other surface to be
heated.
According to my Invention, as applied to marine and Cornish boilers, for
example, I propose to pack or fill in the flue behind the furnace or fire-bridge
with open brickwork of fire-brick, fire-tiles, or fire-clay lumps, made either
solid or hollow, the interstices being so disposed as to sift the current of hot
air without stopping the draught. By this means the heat which is not
immediately taken up by the boiler plates is stored in or collected by the
fire-bricks, whence it radiates off to the boiler; these fire-bricks soon attain
a very elevated temperature throughout the entire portion or length of the
flue on which they are placed, and impart a more uniform degree of heat
throughout the length of such flue. An additional supply of air may with
this arrangement be admitted to the fuel above the grate, and hence a more
perfect combustion is obtained and the prevention of smoke effected with a
corresponding economy of fuel.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same, and for that purpose shall refer
to the several Figures on the annexed Sheet of Drawings, the same letters of
reference indicating corresponding parts in all the Figures.
Figures 1 and 2 of my Drawings represent respectively a transverse and
longitudinal vertical section of a Cornish boiler, the internal flue of which is
packed with open brickwork which acts as a magazine or storer of heat
without sensibly impeding the.draught.
A is the shell of the boiler; B, the furnace constructed in the ordinary
manner in the internal flue C; D, D, are the fire-bars; and, E, the fire-bridge.
Behind the furnace and fire-bridge I pack into the flue a range or series of
fire-bricks F, F, extending along the whole or the greater portion of the length
of the flue, open spaces a, a, being left between the fire-bricks in order that
the current of hot air may be sifted, as it were, without at the same time
sensibly obstructing the draught.
Figures 3 and 4 represent respectively a transverse and longitudinal vertical
section of a modification of the arrangement shewn at Figures 1 and 2.
A is the boiler shell; B, the furnace; C, the internal flue; D, D, the fire-
bars; E, the bridge; and F, F, the fire-clay heat magazine, which in this
case is applied in the form of tubes laid along the full length or the greater

page_text: portion of the length of the flue C, and supported in their places on the
bottom of the flue by bricks c, c, at every joint; these fire-clay tubes are in
free communication with the ash-pit through the opening d, and are closed at
their inner end e; they are perforated on their upper surfaces, as shown at a.
The several joints at b, b, may be made quite close and air-tight, or left
sufficiently open to allow of the escape of hot air from the interior of the tubes
through the the joints b as well as through the perforations a into the flue C,
where the several jets of hot air mix with the unconsumed gases or products of
combustion and effect their ignition, thereby preventing the formation of
smoke. The heat from the furnace soon raises the fire-clay tubes to a red
heat, and consequently the air which enters therein from the ash-pit is
considerably elevated in temperature before it issues in the form of a number
of fine jets through the lateral perforations or openings in the tubes, and
mingles with the gases, which are thereby ignited. I thus obtain a more
perfect combustion and prevention of smoke as well as a more uniform
temperature throughout the flue produced by the radiation from the highly
heated tubes in such flue.
Having now described and particularly ascertained the nature of my said
Invention, and the manner in which the same is or may be used or carried
into effect, I would observe in conclusion that what I consider to be novel
and original, and therefore claim as the Invention secured to me by the
herein-before in part recited Letters Patent is,
First, the partial filling of the flues of steam boiler and other furnaces
with open brickwork, fire-tiles or pipes, or fire-clay lamps in such manner
as to constitute a heat magazine or storer without sensibly impeding the
draught of the furnace, as herein-before described.
Second, the application of heat magazines or storers of the description
herein-before mentioned to the flues of marine and Cornish boilers sub-
stantially as herein-before described and illustrated by my Drawings.
In witness whereof, I, the said Humphrey Chamberlain, have to this my
Specification set my hand and seal, this Eighth day of November,
One thousand eight hundred and sixty-seven.
IIUMPHREY CHAMBERLAIN. (L.S.)