A NEW METHOD OF APPLYING FIRE FOR THE PURPOSE OF HEATING OF BOILERS AND OTHER VESSELS WHERE HEAT IS REQUIRED, AND WHICH MAY ALSO BE APPLIED TO OTHER USEFUL PURPOSES
Year: 1798

page_text: ROWNTREE'S SPECIFICATION.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
ROWNTREE, of Great Surry Street, Blackfriars Bridge, in the Parish of
Christchurch, in the County of Surry, Engine Maker, send greeting.
WHEREAS His most Excellent Majesty King George the Third, did, by
His Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the First day of May, in the thirty-eighth year of His reign, give
and grant unto me, the said Thomas Rowntree, His especial licence that I, the
said Thomas Rowntree, during the term of years therein mentioned, should
and lawfully might use, exercise, and vend, within England, Wales, and the
town of Berwick upon Tweed, my Invention of "A NEW METHOD OF APPLYING
FIRE FOR THE PURPOSE OF HEATING OF BOILERS AND OTHER VESSELS WHERE HEAT IS
REQUIRED, AND WHICH MAY ALSO BE APPLIED TO OTHER USEFUL PURPOSES;" in
which said Letters Patent there is contained a proviso obliging me, the said
Thomas Rowntree, by an instrument in writing 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 one calendar month 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, I, the said
Thomas Rowntree, do hereby declare that my said Invention is described in.
manner following, that is to say :-
For heating of coppers, boilers, furnaces, ovens, and stoves, my fire-place is
much smaller than heretofore made use of for the same sized copper, boiler,
furnace, oven, or stove; (instead of placing my fire-place, according to the
common practice, immediately under the boiler or other vessel) I place it at

page_text: the front side or end, as I see most convenient, in such a manner as to oblige
the flame to rise in the front side or end and pass all round the vessel, &c.,
which at the same time it strikes the bottom of the vessel, &c. without suffer-
ing the flame to pass off in a flue or flues, as it usually does in the common
way, and by that means sending the heat into the flues, instead of its being
used where it ought to be, namely, on the vessels, &c. This my method
effectually prevents; for by means of a small perpendicular or other opening
into a box or trap, which I call a reservoir, and which I place horizontal or
diagonal as the situation may require, and is made of iron, brick, stone, or any
other material capable of bearing heat, where a valve is placed riding on
centres or otherwise, and standing in a diagonal or other direction as is found
most convenient, the flame is returned or impeded in its progress to the
chimney, and made to descend below the bottom of the vessel, and passes out
at the bottom, top, or side of said box, trap, or reservoir into the common
chimney; this reservoir is placed between the vessel, &c. and the chimney.
To the opening which admits the flame into the reservoir is affixed, when
necessary, sliders, registers, or stops, which serve to encrease or diminish the
heat; the valve in the reservoir is for the same purpose in another degree,
which more immediately appertains to increasing or diminishing the draft,
which it does by moving the said valve into different positions as the speed of
the operation may require.
In witness whereof, I, the said Thomas Rowntree, have hereunto set my
hand and seal, this Thirty-first day of May, in the year of our Lord
One thousand seven hundred and ninety-eight.
THO ROWNTREE. (L.S.)
AND BE IT REMEMBERED, that on the Thirty-first day of May, in the
thirty-eighth year of the reign of His Majesty King George the Third, the
said Thomas Rowntree came before our said Lord the King in His Chancery,
and acknowledged the Instrument aforesaid, and all and everything therein con-
tained and specified, in form above written. And also the Instrument aforesaid
was stamped according to the tenor of the several Statutes made in the sixth
year of the reign of the late King and Queen William and Mary of England,
and so forth, and in the seventeenth, twenty-third, and thirty-seventh years of
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