FIRE-PROOP EARTHEN CASES OF DIFFERENT SHAPES, WITH HEATERS MADE OF THE SAME COMPOSITION, FOR THE WARMING OP BEDS, DISHES, PLATES, &C., LIKEWISE FOR WARMING AND KEEPING COM- FORTABLE THE FEET IN CARRIAGES, PEWS OF CHURCHES, &c.
Year: 1786

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
FREDERICK HEMPEL, Melting Pot Manufacturer, of Cheyne Row, in the
Parish of Saint Luke, Chelsea, in the County of Middlesex, send greeting.
WHEREAS His most Excellent Majesty King George the Third, by His
Letters Patent under the Great Seal of Great Britain, bearing date the
Seventh day of February, in the twenty-sixth year of His reign, did give
unto me, the said Charles Frederick Hempel, His special licence, that J, the
said Charles Frederick Hempel, during the term of years therein expressed,
should and lawfully might make, use, exercise, and vend, within that part of the
Kingdom of Great Britain called England, the Dominion of Wales, and
Town of Berwick-upon-Tweed, my Invention of "FIRE-PROOP EARTHEN CASES
OF DIFFERENT SHAPES, WITH HEATERS MADE OF THE SAME COMPOSITION, FOR THE
WARMING OP BEDS, DISHES, PLATES, &C., LIKEWISE FOR WARMING AND KEEPING COM-
FORTABLE THE FEET IN CARRIAGES, PEWS OF CHURCHES, &c. ;" in which said Letters
Patent there is contained a proviso obliging me, the said Charles Frederick
Hempel, by an instrument in writing under my hand and seal, to cause a
particular description of the nature of my said Invention, and how the same
is to be performed, to be inrolled in His Majesty's High Court of Chancery
within one calendar month next after the date of the said Letters Patent, as
in and by the same (relation being thereunto had, may more fully and at
large appear).
NOW KNOW YE, that in pursuance of the said proviso, I, the said
Charles Frederick Hempel, do declare that my said Invention for Fire-proof
Earthen Cases of different Shapes, with Heaters made of the same Compo-

page_text: sition for the Warming of Beds, Dishes, Plates, &c., Ikewise for warming
and Keeping Comfortable the Fect in Carriages, Pews of Church, &c., is
described in the manner following (that is to say):-
For plates and dishes, the cases are formed, moulded, thrown, or turned
on a potter's wheel, according to the size or shape of the plates or dishes, oval,
round, or otherwise, with or without covers, something in the height and form
of water plates or deep carthen soup plates, and contrived to admit an earthen
heater, of a proportionable size, to warm the plates and dishes which are
placed on the same. For the kitchin or common use, the cases have at the
top a rim much the same as a plate; and for the table they are made without
the rim, so as to be put into suitable outside cases invented and constructed
of the yellow or queen's ware, with rims for the purpose. All the fire-proof
earthen cases are made of the same materials as the heaters, in such manner
as to partake of and retain their heat, and to contribute jointly to warm the
plates and dishes or the objects for which they are intended, which renders
them more sweet, safe, and effectual than any heaters of iron or earth here-
before invented to be used in cases of silver-plated iron or tin. And in order
to prevent all possible accidents of singeing, &c., a small rost of an earthen
ring or cross is formed on the bottom of the cases; and there are small plates
of block tin, or other kind of metal, to put under or upon the heater in case
it should be found too hot. For beds, the cases consist of two sorts, the first
being a small broad-bottomed case with a heater, to be used in any common
warming pan in the room of coals, &c., and the second in the form of a close
mufler, with an earthen rost to put a piece of block tin on the same, and with
the door to admit and secure a heater, and may be wrapped in flannell, and used
overnight in bed or otherwise. For the use of carriages, the form is likewise
that of a large mufler, with the same inside apparatus to receive the heater,
and secured by a door which slides in front, and may be rendered more con-
venient by some covering of linen or carpeting, &c. For pews of churches,
the case intended for pews of churches, &c. may be formed with a broad
bottom, much the same as those for the warming pans to be put in stands, or
boxes made of iron, brass, or copper; but for these, and every other purpose
in which the cases and heaters may be required, they will in like manner be
shaped according to the object to which they are to be applied. The com-
position out of which the fire-proof cases and heaters are thrown, turned,
moulded, or formed, consist chiefly in the materials out of which the crucibles
are made; Stourbridge clay, with a small quantity of ground broken melting
pots or burned clay, or, in the room thereof, that sort of clay which comes
from the surface of the coal mines, are the most essential materials. They

page_text: should be mixed up with about the fourth part of pipe clay, and one eighth
part of Windsor loome, which, properly worked together, formed, or moulded,
and strongly burned or baked in a potter's kiln, with or without glazing,
makes the fire-proof cases and heaters for the above purpose; but as some of
the above sorts of clay and composition differs in quality, the quantity of each
sort to be taken must in some measure be left to the experience and discretion
of the maker to compound them in such proportion as to render the cases and
heaters fire-proof.
In witness whereof, I, the said Charles Frederick Hembel, have here-
unto set my hand and seal, this Sixth day of March, in the year of
our Lord One thousand seven hundred and eighty-six.