A METHOD OF BURNING OR CONSUMING SMOKE
Year: 1828

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
FORBES, of Cheltenham, in the County of Gloucester, Architect and Surveyor,
send greeting.
WHEREAS His present most Excellent Majesty King George the Fourth,
by His Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Fifteenth day of December, in the ninth year of His reign, did,
for Himself, His heirs and successors, give and grant unto me, the said John
Forbes, His especial licence that I, the said John Forbes, my exors, adîiors, and
assigns, or such others as I, the said John Forbes, my exors, admors, or assigns,
should at any time agree with, and no others, from time to time and at all
times during the term of years therein expressed, should and lawfully might
make, use, exercise, and vend, within England, Wales, and the Town of
Berwick upon Tweed, my Invention of "A METHOD OF BURNING OR CONSUMING
SMOKE;
"in which said Letters Patent is contained a proviso obliging me, the
said John Forbes, by an instrument in writing under my hand and seal,
particularly to describe and ascertain the nature of my said Invention, and in
what manner the same is to be performed, and to cause the same to be enrolled
in His said Majesty's High Court of Chancery within six calendar months next
and immediately after the date of the said recited Letters Patent, as in
and by the same, reference being thereunto had, will more fully and at large
appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
John Forbes, do hereby declare the nature of my said Invention to consist in
placing the fire-grate from which the smoke rises immediately under another
fire-grate, and then by a new arrangement for quickening the draft, causing
the smoke from the under grate to pass through a clear fire in the upper grate,
which burns or consumes it as aforesaid; and in further compliance with the
said proviso, I, the said John Forbes, do hereby describe the mauner in which
my said Invention is to be performed, by the following description thereof,
reference being had to the Drawing annexed, and to the figures and letters
marked thereon (that is to say):-
DESCRIPTION OF THE DRAWING.
Figure 1 represents the front of a fire-grate. «, a, a, is the front or frame
of the grate, but extended on each side to suit the chimney opening.
b, b, b, b, is made curved or straight, behind which is a vertical sliding
blower of the same form. c, c, is the bottom of the lower fire-grate;
d, d, is the bottom of the upper fire grate; e is a square opening in the
iron back for the current, with heat, smoke, and dust, to ascend through a
tube into chimney, as herein-after described. f is a knob or handle by which
to draw the blower up and down, which regulates the draught and thereby
increases or reduces the heat, being hung and fixed similar to a sash of a
window, with chains, weights, and pullies. is a recess at the back to facilitate
the passage of the smoke and flame from the lower to the upper fire. h, h, are
the pulleys on which the chains (with weights) move when the blower is used;
i, i, the weights behind the frame, put in a collar to keep them steady as they
move; k, k, flat or curved jambs, with openings at the top to admit heat from
the air chambers Q, Q, into the room; m, m, cheeks having openings at the
upper part to admit heat into the jambs at each side. n is the back of the
grate, to which is fixed the tube of cast or sheet iron P, which conducts the heat,
smoke, &c., up the chimney, and also quickens the draught. The bottom of the
tube must be made horizontal; the upper part should be perpendicular to it,
and the meeting joint where it is united should be curved (see section or
profile), but placed at such an angle as circumstances require, and fixed about
6 to 9 inches from the top O of the grate, which is made flat. S, the cap over
the tube, made two inches wider in diameter than the top of the tube, and is
intended to assist in contracting the draught and preventing the wind forcing
back the heat, smoke, and dust into the room; R, a pan for the ashes and
cinders of the grate to fall into. Figure 2 is a plan showing the manner of
setting the grate. The red colour shows the sides and back of the chinıncy

page_text: recess or fire place in which the grate is set. Y is a partition wall of brick-
work, built so as to leave a space between the back of the grate and the back
of the chimney recess, which is to form an air chamber X, to receive the great
warmth from the heated iron back of the grate, which, with the heat from the
fire, rapidly warms the brick flue or chimney, and when sufficiently so rarefaction
is kept up and the draught is thereby increased; the flue, on account of the great
heat, becomes impervious to cold, and thus I prevent the wind from rushing
downwards, and also the smoke and heat being thereby blown into the room. It
may be well here to state that similar letters are used to denote similar parts in all
the Figures. a, a, is the front of the grate; b, b, casing, behind which the
blower slides down to the top bar of the upper fire. d is the space for the fuel
of the clear fire, having extra backs, as is usual; under it is the fire C of
coal; c, opening into the flue; the blower handle; g, the recess in the iron
back; h, h, the pulleys. k, k, are the jamb fronts; m, m, the cheeks or covings,
made straight or curved on plan; n, back of grate; P, the iron tube; Q, Q,
chambers for hot air; R, the dust pan; t, grooves in which the blower
moves. Figure 3 is the section and profile of the grate. Those parts colored
red show the brick at the front and back of the chinney flue. Z is the fluc;
X is the chamber for heat from the iron back; Y is the brick separating the
chamber from the grate; a, a, the frame in front; b, b, the case in front of the
blower; c, bottom of the lower fire grate, made to slide horizontally in grooves
to take off, if required; d, bottom of the upper fire grate; c, the entrance
for the draught, &c. through the iron tube P into the chimney; f, handle
of the blower; y, the recess at the back of the two grates; h, the pulleys;
m, the cheeks, made curved or straight on plan; n, the back of the grate, made
to open at bottom, or to take off at top, for the purpose of cleansing the flue;
O, flat top; P, iron tube; 1, the dust pan; r, the blower; S, the cap over
the tube; t, t, the grooves, in which slides the blower. In making use of my
said Invention it is only necessary to observe that the upper fire should be
lighted first, and should be made of coke, stone, coal, cinders, or charcoal, but
f mixed at first lighting with a little bituminous coal, it will ignite better and
more quickly, when a bright clear fire is obtained in the uper grate keep it
well fed, and a fire of any bituminous coal may be lighted in the lower grate.
The recess g in their on back allowes the smoke and flame of the under fire to
pass better into the upper one, where, by the aid of the quickened draught,
the clear fire burns or consumes the smoke, the blower being lowred as
occasion may require.
Now whereas I claim as my Invention the arangement of one fire grate
over another, with the recess g communicating with both, in manner aforesaid,

page_text: as also the air chambers X, X, and the application of the tube and cap P, S, to
the back of the upper grate, for the purpose aforesaid, all which are necessary
to and constitute my method of burning or consuming smoke, and such my
Invention being to the best of my knowledge and belief entirely new, and
never before used within that part of His said Majesty's United Kingdom of
Great Britain and Ireland called England, His said Dominion of Wales, or
Town of Berwick upon Tweed, I do hereby declare this to be my Specification
of the same, and that I do verily believe this my said Specification doth comply
in all respects fully and without reserve or disguise with the proviso in the
said herein-before in part recited Letters Patent contained. Wherefore I do
hereby claim to maintain exclusive right and priviledge to my said Invention.
my
In witness whereof, I, the said John Forbes, have hereunto set hand
and seal, this Fifteenth day of June, in the the year of our Lord One