IMPROVEMENTS IN STOVES AND FURNACES, AND IN CHIMNEY POTS AND REGULATORS
Year: 1850

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...SLATE'S SPECIFICATION..
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN. SLATE,
of Wandsworth, in the County of Surrey, Accountant, send greeting.
'
WHEREAS Her, most Excellent Majesty Queen Victoria, by Her Royal
Letters Patent under the Great Seal of the United Kingdom of Great Britain
and Ireland, bearing date, at Westminster, the Second day of..November. (One
thousand eight hundred and fifty), in the fourteenth year of Her reign, did, for.
Herself, Her heirs and successors, give and. grant unto me, the said John
Slate, my exors,, adñiors, and assigns, Her special license, full power, sole
privilege and authority, that I, the said John Slate, my exors, admiors, or
assigns, or such others as I, the said John Slate, my exors, adññiors, 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 "IMPROVEMENTS IN STOVES AND FURNACES,
AND IN CHIMNEY POTS AND REGULATORS;" in which said Letters Patent is con-
tained a proviso, that I, the said John Slate, shall cause a particular descrip-
tion of the nature of my said Invention, and in what manner the same is to be
performed, by an instrument in writing under my hand and seal; to be enrolled
in Her Majesty's High Court of Chancery within six calendar months next and
immediately after the date of the said in part 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
Slate, hereby declare that the nature of my said Invention, and the manner in
which the same is to be performed, are fully described and ascertained in and
by the following Specification thereof, reference being had to the Drawings
hereunto annexed (that is to say):
Firstly, my Invention, in so far as it relates to stoves, furnaces, and regu-
lators, has for its object the cure or prevention of smoke, and the creation of a
better draught in the chimneys of what are called "register" stoves and grates,
and of other stoves, grates, and ranges.
Figure 1 is a front view of a stove constructed according to my improve-
ments (with a portion of the front plate removed to shew the new parts);
Figure 2 is a plan of the top; and Figure 3, a front view of the top, with the
register plate removed. A is the fire box; B, B, the sides of the stove, which
are formed of two plates or slabs hinged together at their inner edges, one of
which (B') is fixed, and the other (B) moveable towards the front of the stove
or grate. As the moveable plates or slabs are drawn forwards from the sides
they increase the draught at the front, and cause an additional current of air
iminediately under the flue on either side; C is the register plate, which is
inclined upwards from the front to the back of the stove, and partially encloses
or covers the top. This plate may be hinged or not, in which latter case it
would be retained in position by a catch as at a, to admit of its being readily
removed when the chimney was required to be swept. D, D, are two
triangular flaps hinged to the moveable plates or sides of the stove B, B, and
supported when in their open position by hanging brackets attached to their
under sides. These triangular flaps extend as far as the ends of the plate C
when in their open position, and move under that plate when the wings B, B,
are brought forward; E, E, are two other angular flaps hung loosely to the
front of the stove by a bolt and nut at b, and resting against the tops of
the moveable sides of the stove so as to cover completely the top of the stove,
and prevent any downward current; F is a vane or smoke director placed in
the throat of the chimney, and centered on a pivot at the back so as to be
capable of being turned either way, and thereby direct the current of smoke
or air up a right or left hand flue as may be required.
Figure 4 is a front view of a stove fitted with my improvements, in which
the stove is made of open work; behind which the moveable sides traverse.
The front of the stove will in this case present the same appearance when the
moveable slabs are closed or extended. Instead of this arrangement I some-
times attach to the front edge of the shifting sides B, B, screens of ornamental
open work, which are drawn forward with the sides when they are opened.

page_text: and retire from view when the sides are closed. I prefer to make the fire
boxes of my improved stoves with the bars in a vertical instead of a horizontal
position, but inclined inward slightly from the bottom to the top. I also make
these vertical bars in the form of a semi-cylindrical trough, and place them
with their concave sides inwards, so as to give the smoke, &c. an upward
direction.
My improvements may be also applied to the kitchen ranges, in which case
the sides B, B, would be moveable only from the slab cr upper surface of the
range to the throat of the chimney.
Secondly, my Invention consists of certain chimney pots of an improved
construction, which may be applied to chimneys of stoves of the ordinary
description, or may be used in conjunction with my improved stoves or gratés
before described. Figure 5 is an external elevation of one of my improved
chimney pots. A is the stalk of the pot (which is shewn as of a cylindrical
form, but may be of any other convenient shape). B is the cowl, which I
prefer to make of a screw or 'spiral form, the threads of the screw or spiral
being set at an angle and kept apart by stays c, c. The effect of this peculiar
form of cowl is to prevent the smoke from beating down, or a current of air
from passing downwards into the chimney.
Figure 6 is an elevation of another of my improved chimney pots, which
differs only from that last described in having a series of apertures in the
chimney pot, as shewn at C, C. Figure 7 is an elevation of a third form of a
chimney pot, which I employ in conjunction with my improved stoves and
grates. A is the body of the pot; B, the cowl, which I make of the form of
the frustum of a conc. The apex of the frustum is surmounted by
a cylindrical stem C of less diameter than the body of the chimney pot, and
on the top of this cylindrical portion I place a hood D of the form of an inverted
semicircular trough. I also provide two, three, or more similar cylindrical
stems E, E, with hoods, which I attach to the conical cowl, in which suitable
apertures are provided to admit of the stems and hoods being secured thereto.
Figure 8 is an external elevation; and Figure 9, a vertical section of a chimney
pot, which is an improvement upon the one registered by me on the Sixth of
October, One thousand eight hundred & forty-seven, which I also employ in
conjunction with my improved stoves and grates. The improvement consists
in having two spiral ledges F, F, attached to the interior of the pot, with
apertures G, G, and leaves H, H, by which the air entering at the apertures
will be directed upwards, and pass off with the ascending current of smoke &
air at the top of the chimney. In all cases in which chimney pots of any of
the forms herein-before described are applied to chimneys, it is necessary that

page_text: the interior of the chimney at the top should coincide exactly with the internal
size of the chimney pot, as it will be found that so good an effect will not
otherwise be produced, the difference in size presenting a projecting
against which the smoke will impinge in its upward passage, and be prevented
from issuing freely from the top of the chimney pot.
Having now described the nature of my said Invention, and in what manner
the same is to be performed, I declare that what I claim as of my Inven-
tion is,―
First, the construction of register stoves or grates and ranges, with double
cheeks, one fixed and the other moveable, with the register plate inclined
upwards from the front to the back of the chimney, and with a shifting smoke
director placed in the throat of the chimney, as represented by Figures 1, 2, 3,
and 4, and before described:
And, second, the several constructions of chimney pots represented in
Figures 5, 6, 7, 8, and 9, as before described.
In witness whereof, I, the said John Slate, have hereunto set my
hand and seal, this Second day of May, in the year of our Lord One
thousand oight hundred and fifty-ong