AN IMPROVEMENT ON COOKING APPARATUS
Year: 1822

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TO ALL TO WHOM THESE PRESENTS SHALL COME, wе, THOMOS
POSTANS, of Charles Street, in the Parish of Saint James, Gentleman, and
WILLIAM JEAKES,, of Great Russel Street, Bloomsbury, Ironmonger, send
greeting:
:
WHEREAS His most Excellent. Majesty King George the Fourth, did, by
His Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland; bearing date at Westminster, the Twenty-sixth day of
¡June, One thousand eight hundred and twenty-two, in the third year of His
reign, give and grant unto us, the said Thomas Postans and William Jeakes,
our exors, admors, and assigns, His especial licence, full power, sole privilege
and authority, that we, the said Thomas Postans. and William Jeakes, our
exors, admors, and assigns, should and lawfully might make, use, exercise,
and vend, within England, Wales, and the Town of. Berwick-upon-Tweed, our
Invention of "AN IMPROVEMENT ON COOKING APPARATUS ;".. in which said Letters
Patent there is contained a proviso, that if we, the said Thomas Postans
and William Jeakes, or one of us, shall not particularly describe and ascertain
the nature of our said Invention, and in what manner, the same is to be per-
formed, by writing under our hands and seals, or under the hand and seal of
one of us, and cause the same to be inrolled in His Majesty's High Court of
: Chancery within two calendar, months next and immediately after. the date, of
the said Letters Patent, that then the said. Letters. Patent and all liberties
and advantages whatsoever thereby granted, shall utterly cease, determine, and
become void, as in and by the same,. (relation being thereunto had), wil more
fully and at large appear..
NOW KNOW YE, that in compliance with the said proviso, we do hereby
describe and ascertain the nature of our said Invention, and the manner in

page_text: which the same is to be performed, in and by the Drawing hereunto annexed,
and the following description thereof, (that is to say):
Our improvement on cooking apparatus consists in the construction of a
cover or frame to be placed upon a cooking plate or hot plate; the object of
this cover is to retain the heat of the hot plate and prevent it from being
cooled by the surrounding atmosphere.
In the annexed Drawing, Fig. 1 represents the upper surface of the frame
having sundry apertures, each of which is intended to receive a saucepan or
stewing vessel; but in this view all these apertures are closed by lids.
Fig. 2 shews a section, taken vertically through the middle of the frame,
and hot plate. A is the hot plate upon which the edges of the frame B, B, B, B,
rests; this plate may be heated by a furnace under it as usual; C, C, C, are
apertures above mentioned, into which the saucepans or stewing vessels are
introduced so as to receive the heat of the hot plate beneath, but when not
occupied by saucepans or stewing vessels, the apertures are to be closed by the
lid; D, D, is the section of a partition, made of fire-stone, which is.supported
by a thin plate of iron E, rivetted to the sides of the frame; F is a space
between the fire-stone partition and the upper surface of the frame which is
proposed to be filled up with pounded charcoal or other material which may be
imperfect conductor of heat. The heat from the hot plate A in ascending is
stopped by the fire-stone partition, and again by the non-conducting material
above it, by which means the upper surface of the frame remains nearly in
a cold state, and the heat of the hot plate is retained for the purposes of cooking
without being subjected to the action of the cold atmospheric air. It may,
however, be sometimes convenient to have the upper part of the frame warm,
this would be the case if the non-conducting medium of charcoal was removed
from the space F, and still the heat of the hot plate would be sufficiently
retained for the purposes of cooking, being enclosed from the action of the
atmosphere by the frame with its fire-stone partition. We do not mean to
limit ourselves to any particular dimensions, to any precise number of aper-
tures, or to the sort of metal of which the frame may be constructed. The
ordinary dimensions of these frames we propose to be about thirty-two inches
by twenty-seven inches, and about five inches high, the frame being about.
half an inch thick and of cast-iron.
In witness whereof, I, the said Thomas Postans, have hereunto-set my
hand and seal, this Twenty-sixth day of August, in the year of our
Lord One thousand eight hundred and twenty-two.
THOMAS (L.s.) POSTANS.

page_text: AND BE IT REMEMBERED, that on the Twenty-sixth day of August,
in the year
of our Lord 1822, the aforesaid Thomas Postans came before our
said Lord the King in His Chancery, and acknowledged the Specification
aforesaid, and all and every thing therein contained and specified, in form
above written. And also the Specification aforesaid was stamped according
to the tenor of the Statute made for that purpose.
Inrolled the Twenty-sixth day of August, in the year of our Lord One
thousand eight hundred and twenty-two.