AN IMPROVED METHOD OF COMBINING AND USING FUEL IN STOVES, FURNACES, BOILERS, AND STEAM ENGINES
Year: 1823

page_text: CHRISTIE AND HARPER'S SPECIFICATION.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN
CHRISTIE, of Mark Lane, in the City of London, Merchant, and THOMAS
HARPER, of Tamworth, in the County of Stafford, Merchant, send greeting.
WHEREAS His present Majesty King George the Fourth, in and by His
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Ninth day of October last, for Himself, His heirs and successors,
did give and grant unto us, the said John Christie and Thomas Harper,
our exors, adiñiors, and assigns, His special licence, full power, sole privilege
and authority, that we, the said John Christie and Thomas Harper, our
exors, adiiors, and assigns, and every of them, by ourselves or by our deputy
or deputies, servants or agents, or such others as wc, the said John Christie
and Thomas Harper, our exors, adiñors, or assigns, should at any time
agree with, and no others, from time to time and at all times thereafter during
the term of years therein expressed, should and lawfully might make, use,
exercisc, and vend, within England, Wales, and the Town of Berwick-upon-
Tweed, our Invention of "AN IMPROVED METHOD OF COMBINING AND USING FUEL
IN STOVES, FURNACES, BOILERS, AND STEAM ENGINES;" in which said Letters
Patent there is contained a proviso obliging us, the said John Christie and
Thomas Harper, or one of us, by an instrument in writing under our hands
and seals, or the hand and seal of one of us, particularly to describe
and ascertain the nature of the said Invention, and in what manner the
same is performed, and to 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 recited Letters Patent, as in and by the same,
reference being thereto had, will more fully appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, we, the said
John Christie and Thomas Harper, do hereby declare that the nature of our
Invention, and the manner in which the same is performed, are as follows:-
Our said Invention consists in combining bituminous coal of a caking
quality with culm (that is to say), the culm or small of stove coal or anthracite,
and forming the same for use as fuel into coke in ovens by the usual modes.
The culm may either be taken in the casual or usual form of such culm, or be
made expressly for the purpose by breaking the larger stone coal by common
mechanical means into such culm or small. We combine the bituminous coal
and the culm in various proportions, according to the qualities of each, which
vary in different situations; our rule of admixture being to combine as much
as possible of the culm with as little of the bituminous or caking coal as may
be sufficient to form a good coherent coke; but we have in general found
equal quantities in weight to be a suitable proportion. The coke thus formed
is applicable for use either by itself or in combination with other fuel in stoves
and furnaces, and for heating boilers and steam engines where coke is appli-
cable, and in particular our said coke may be very advantageously used'in
furnaces for the smelting and manufacture of iron.
In witness whereof, we have hereunto set our hands and seals, this
Ninth day of December, One thousand eight hundred and twenty-