A PORTABLE AND MOVING FURNACE FOR THE PURPOSE OF HEATING OF OVENS OF EVERY DESCRIPTION, WHEREBY MUCH FUEL WILL BE SAVED AND THE OVEN RENDERED MORE SAFE AND COMMODIOUS
Year: 1798

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TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
HOWDEN, of Hoxton, in the County of Middlesex, Baker, 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 West-
minster, the Twentieth day of February, in the thirty-eighth year of His reign,
give and grant unto me, the said Robert Howden, His especial licence that I,
the said Robert Howden, 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 PORTABLE AND MOVING
FURNACE FOR THE PURPOSE OF HEATING OF OVENS OF EVERY DESCRIPTION, WHEREBY
MUCH FUEL WILL BE SAVED AND THE OVEN RENDERED MORE SAFE AND COMMODIOUS;"
in which said Letters Patent there is contained a proviso obliging me, the said
Robert Howden, 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.

page_text: NOW KNOW YE, that in' compliance with the said proviso, I, the said
Robert Howden, do hereby declare that my said. Invention is described in the
plan and description thereof hereuntorannexed..
In witness whereof,. I,. the said: Robert Howden;. have hereunto set my
hand and seal, this Twentieth day of March, in the year of our Lord
One thousand seven hundred and ninety-eight.

page_text: any part of the Oven at pleasure by means of the Air Box on which it rests.
Air Box receives the Air from the Tube or Pipe, and communicates it (up through
the Grate, or between the Barrs) to the fuel, whereby the fire is continued with
proper effect.
Tube or Pipe conveys Air to the Air Box under the Furnace, in any part of the
Oven; to which it is readily directed.
Temporary Door prevents any air from entering the Oven but through the Tube
or Pipe; or any vapour issuing therefrom but by the Flue or Chimney, whereby the Draft
fully effect the operation. By lowering the Regulator the bottom of the Oven obtains
a due proportion of heat.
necessary direction.
The Slide readily admits the Tube or Pipe to take every
Two or more Furnaces, with proper apparatus, may be set, and used, in one Oven,
at one and the same time if necessary.
A. The Furnace wherein (at B.) is a Grate or Barrs at the bottom (made eith
connected therewith or seperate) on which fuel is placed.
C. The Air Bex (made with or without Castors) open at the furnace rests) an
the Aperture in the side at D.
E.The Tube or Pipe which passes through the door at the aperture G. (or
through any aperture that may be made in any other part of the Oven) enters
the Air Box at the aperture D.
F. The Temporary Door fitted to enclose the Oven mouth, and the Flue or
Chimney.
H. The Regulator raised or lowered at pleasure.
I. The Slide which closes on the Tube or Pipe.
K.The Peephole with a sliding cover) through which the operation in the
Oven is viewed.
The Furnace Air Box, Tube or Pipe and Temporary Door;may be con
structed of Iron or any other Metal either simple or compounded; wrought
or cast, or of any materials whatever, simple or compounded, which shall be
capable to contain and sustain fire, and all the apparatus may be made or
moulded in any form or shape whatever.
Furnace and Air Box may be constructed either conjunctively or disjunctive