MY STOVE ON A NEW CONSTRUCTION, AND VARIOUS IM- PROVEMENTS APPLICABLE TO STOVES, GRATES, AND FIRE-PLACES
Year: 1807

page_text: POLLOCK'S SPECIFICATION.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALLAN
POLLOCK, of Paisley, North Britain, Merchant, do send greeting.
WHEREAS His most Excellent Majesty King George the Third, by His
Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing date at Westminster, the Eleventh day of June,
in the forty-seventh year of His reign, did give and grant unto me, the said
Allan Pollock, my executors, administrators, and assigns, His special licence,
full power, sole privilege and authority, that I, the said Allan Pollock, my exe-
cutors, administrators, and assigns, 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, and in His Majesty's Colonies
and Plantations abroad, "MY STOVE ON A NEW CONSTRUCTION, AND VARIOUS IM-
PROVEMENTS APPLICABLE TO STOVES, GRATES, AND FIRE-PLACES; " in which Letters
Patent there is contained a proviso, obliging me, the said Allan Pollock, under
my hand and seal, to cause a particular description of the nature of my said
Invention, and in what manner the same is to be performed, to be inrolled in
His Majesty's High Court of Chancery within four calendar months next and
immediately after the date of the said recited Letters Patent, as in and by
the same (relation being thereunto had) may more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, T, the said
Allan Pollock, do hereby declare that the nature of my said Invention, and
the manner in which the same is to performed, are particularly described and
ascertained as follows, that is to say :-
In the Drawings hereunto annexed, Fig. 1 represents a perspective view of
my said stove in one of the various forms in which the same may be con-
structed; and Fig. 2 represents the same by a vertical section, shewing the
interior parts in their relative situations; and the Figures 8, 4, 5, 6, 7, and 8,

page_text: shew several of the same parts detached and separate. In the lower com-
partment of the said stove is placed the fire-place or grate, set in or surrounded
with brick or fire stone, or other material of the like nature, as represented by
the parts of the said Drawings, which are coloured yellow, and behind, or (if
thought fit) on any or either or all the sides, except that in which the doors
are made, I dispose and fix a second-back or exterior part of iron, which,
along with the piece A, C, Fig. 4, (in which a set of edge bars or shelves are
cast or fixed) doth afford a winding passage, through which, air being admitted
at the lower part from without, by means of an aperture or apertures left for
that purpose, becomes heated by contact with the stove to a suitable tempera-
ture, but cannot be decomposed or subjected to any-chemical change, because
the interposed mass of brick or fire stone, or other material of liko nature,
prevents the iron or metallic parts from being too strongly heated; and the said
heated air ascends from the said winding passage into the pipe W, W, and
thence into the apartment, through suitable openings in the vase or other
ornamental piece, at top. The space between I the grate, and R the upper
part of the fire-place, is partly closed by a covering or piece represented and
denoted by the same letter R in the Figures 5, 6... In Fig. 5, the piece R is
surmounted by other similar pieces-S and T, more or less in number, as. may
be required, which are fixed thereto in the manner there shewn, and when)
the said compound piece, Fig. 5, is duly placed in the upper part of the stove,
as represented in Fig. 2, the smoke and impure or decomposed air from the
fire is made to ascend by a circuitous or helical course through the several
openings, where its heat is communicated to the pipe W, W, and to the body
of the stove, previous to its escape, which is permitted through the chimney Q:
And I do further declare, that in order the more effectually to prevent any
decomposition or chemical change from being effected at the inner surface of
the said pipe. W, W, or at any other of the surfaces at which air is intended
to be heated and introduced into apartments, it is expedient and of importance
that the said surfaces should possess a hard and glassy coating, for which
purpose I do expressly add such a proportion. of lime or other fit material to
the sand or loam to be made use of in forming my moulds, cores, or other
receptacles or pieces in or upon which the metal is to be cast, as shall render
the said sand or loam partially or to such a degree fusible that the action of the
heat from the fluid and ignited metal shall convert a certain portion of the said
sand or loam into a glassy coating, adhering to and defending the face thereof
from such decomposition or chemical change. And further, that as to the
nature and proportions of lime or other fit material so to be added, I do declare
that the same will require to be varied according to the nature and component

page_text: part of the said sand or loam, and may be determined in each particular
case by a few trials upon principles already well known to chemists and others.
Figures 9 and 10, and Fig. 11 and 12, represent other forms of my said stove,
which is capable of great variation in its figure, and may, if required, be made
in any or all the parts thereof of earthy materials, such as natural or artificial
stone or pottery, or the like, instead of using metal; and in these, as well as
in all other constructions, and in such cases as it may be desired that the fire
should be seen without opening the doors or other apertures of communication
between the apartment and the fire-place, I do close or glaze the said doors
or apertures, or any or all of them, with the material called talc, or Muscovy
talc, set, fixed, or secured therein in a workmanlike manner. And, lastly,
I do apply and use to and with other stoves, grates, and fire-places, as improve-
ments in the same, my method of interposing brick or fire stone, or other
material of the like nature, between the fire-place, and a metallic channel or
flue for heating air; and also my method of coating the metal with a glassy
covering; and also my method of admitting the fire to be seen without opening
the doors or apertures, by means of a closing or glazing of tale, as the said
methods are herein-before described and explained. And in order that the
same may be more clearly understood, I have shewn in Figures 14, 15, 16,
and 17, a common register stove having the said improvements, and being
closed in front by a metallic plate, in which are seen the doors or apertures
G, G, G, and H, the former of which, G, G, G, are glazed with talc.
In witness whereof, I, the said Allan Pollock, have hereunto set my
hand and seal, this Tenth day of October, in the year of our Lord One
thousand eight hundred and seven.