IMPROVEMENTS IN APPARATUS FOR HEATING AND COOKING BY GAS
Year: 1872

page_text: LETTERS PATENT to Charles Weightman Harrison and Alfred Horatio
Harrison, both of Brook Street, Holborn, in the County of Middle-
sex, Gentlemen, for the Invention of "IMPROVEMENTS IN APPARATUS
FOR HEATING AND COOKING BY GAS."
PROVISIONAL SPECIFICATION left by the said Charles Weightman
Harrison and Alfred Horatio Harrison at the Office of the Com-
missioners of Patents, with their Petition, on the 9th March 1872.
We, CHARLES WEIGHTMAN HARRISON and ALFRED HORATIO HAR-
RISON, both of Brook Street, Holborn, in the County of Middlesex,
Gentlemen, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN APPARATUS FOR HEATING AND COOKING BY GAS," to be as
follows (that is to say) :-

page_text: the purposes either of cooking or of heating rooms, or otherwise as may
be required. We construct a chamber, open in front by preference, of a
rectangular form, made of sheets of wrought iron or other suitable
material, and hold them together by means of bolts or otherwise as
found desirable. We also prefer to make these plates of such definite
sizes that any number of the said chambers may be constructed together
side by side or one above the other. The interior surfaces of the
chamber are lined by reflecting plates either plain or corrugated, and at
the top one or more radiating plates are slid in from the front for the
purposes more fully herein-after described. Near the top of the said
chamber we fix a row or number of gas jets with their apertures directed
inwards and slightly in a downward direction, to which the gas from the
supply is conveyed; and when these jets are lighted the heat therefrom
will be radiated in all directions within the said chamber, and by suitable
apertures and passages in the said radiating plates above the said jets the
heated air is made to pass several times backwards and forwards before
being allowed to escape. On the sides of the said chamber we fix one or
more projecting ledges one above the other, upon which slides the tray
or other receptacle which holds the food to be cooked, and we sometimes
mark each of such ledges with the degree of heat or nearly so which
when the gas is fully on the food will be subjected to when placed in
such position for cooking. Along the upper part of the open front of
this chamber we fix a hinge flap, so as to cover up the outer end of
the said radiating plates, and at the same time permit of easy access to
them.
When required we combine with the cooking chamber, in such manner
and position as most effectually to utilize the heat, an oven for baking or
vessels of suitable form for boiling or steaming food, and when necessary
supplement the heat derived from the chamber for these purposes by
separate gas burners, which by preference we construct of an open hollow
cone for the admission of air, with a small jet suitably fixed inside of it;
and as much as possible to utilize the hot air we place in suitable position
slots to carry moveable guards around such vessels, and thus reflect or
radiate the heat upon
them.
For the purpose of heating water the bottom of the vessel in which
it is contained is made concave or corrugated, and with a reflector
underneath, so that the flame of gas for imparting the heat passes
between them.

page_text: The pipe which conveys the gas to the apparatus we place within the
tube or flue, by which the oxidised or spent gas is conducted away, and
by this means attenuate the unburnt gas, thereby ensuring a more com-
plete combustion of its carbon and preventing the deposition of soot
within the chamber.
When the apparatus is not required to be used for cooking we adapt it
to heating the air of rooms or otherwise by placing within the chamber
a suitably formed moveable reflector or reflectors.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Charles Weightman Harrison and Alfred Horatio
Harrison in the Great Seal Patent Office on the 9th September
1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, CHARLES
WEIGHTMAN HARRISON and ALFRED HORATIO HARRISON, both of
Brook Street, Holborn, in the County of Middlesex, Gentlemen, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Ninth day of March, in the year of
our Lord One thousand eight hundred and seventy-two, in the thirty-
fifth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said Charles Weightman Harrison and
Alfred Horatio Harrison, Her special license that we, the said Charles
Weightman Harrison and Alfred Horatio Harrison, our executors,
administrators, and assigns, or such others as we, the said Charles
Weightman Harrison and Alfred Horatio Harrison, our executors, admi-
nistrators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN APPARATus
FOR HEATING AND COOKING BY GAS," upon the condition (amongst others)
that we, the said Charles Weightman Harrison and Alfred Horatio
Harrison, our executors or administrators, by an instrument in writing
under our or their hands and seals, or under the hand and scal of one

page_text: of us or them, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be per-
formed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the
said Letters Patent.
NOW KNOW YE, that we, the said Charles Weightman Harrison
and Alfred Horatio Harrison, do hereby declare the nature of the said
Invention, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following state-
ment thereof, that is to say:-
Our Invention relates to improvements in the construction of apparatus
which may be used either for cooking purposes, heating water, &c., or
for heating the atmosphere of rooms of dwelling houses, and other
buildings by the combustion of gas in an efficient and economical
manner.
And in order that our Invention may be clearly understood and readily
carried into effect, we will proceed to describe the same with the aid of
the accompanying Drawings, reference being had to the letters and
figures marked thereon, and in which Figure 1 is a perspective view of
the apparatus as fitted up for cooking, heating water, &c.; Figure 2, a
front view of same; Figure 3, a transverse vertical section taken on line
A, B, Figure 2; Figure 4, a horizontal section taken on line C, D,
Figure 2; and Figures 5, 6, and 7, views of detached portions thereof;
Figure 8 is a perspective view of the apparatus fitted for warming the
atmosphere of rooms, &c.; Figure 9, an end view of same; and Figures
10 and 11, views of detached portions thereof. In each case the same
letter wherever it occurs indicates the same part or parts.
For the purpose of our Invention we construct a chamber (E) open in
front and by preference of a rectangular form, and made of sheets of
iron or other suitable material held together by bolts or other suitable
contrivance as found desirable. We also prefer to make these plates of
such definite sizes that any number of the said chambers may be con-
structed together side by side, or one above the other. The back and
sides, and when necessary also the bottom of this chamber, are lined
with reflecting plates (F), either plain or corrugated, and when desired
are made movable so as to be easily taken out, cleaned, and replaced, and

page_text: the side ones also bear ledges (G), on which slide and rest the tray and
grid (H) which hold the food to be cooked, and which are so constructed
that when required the tray may be used without the grid. A detached
view of one of these reflector plates is shewn at Figure 5. The said
ledges (G) we mark with the degrees of heat, or nearly so, which when
the gas is fully on the food will be subjected to when placed in such
position for cooking. Near the top of the said chamber we fix a row of
gas jets (I) with their apertures directed inwards, and slightly in a
downward direction to which the gas from the supply pipe (J) is con-
veyed. Thus as will be seen from the Drawings the food during the
process of being cooked within the said chamber is underneath the gas
jets or source of heat. Above the said row of jets we place one, two, or
more plates which we term radiating plates, and two of which (K) are
shewn in the accompanying Drawings and detached at Figure 6. These
are slid in from the front on suitable rests, and so as to be easily removed
and cleaned, and are covered up at their front ends by a movable flap
(L). They are also provided with suitable apertures (M) for increas-
ing the draft, and for causing a repeated backward and forward
passage of the heated air (see Figure 3), so as to utilize its heat as
much as possible before it is allowed to escape through an aperture
(W, Figure 3,) provided for that purpose in the back, and also for the
purpose of preventing the escape of free carbon into the atmosphere,
and the deposition of soot within the said chamber (E) through
imperfect combustion. These plates (K) also serve for radiating or
reflecting the heat in a downward direction. Thus when the gas is
lighted in the said chamber the heat therefrom will be reflected in all
directions, and either on to the food to be cooked or on to a reflector
formed as herein-after described to throw the heat out into the room.
When desired we combine with the said cooking chamber (E), in such
manner and position as most effectually to utilize the heat, an oven (N)
for baking, and vessels of suitable form (O, P, Q,) for boiling or steaming
food, and when necessary supplement the heat derived from the chamber
for these purposes by separate gas burners (R, S, T). The said vessels
(O, P, Q,) we form with concave or corrugated bottoms, and placed
underneath them reflectors (U) for the purpose of reflecting or radiating
on to them the heat from the supplementary burners. These reflectors
are made either fixed or movable and are shewn detached at Figure 7.

page_text: heat in an outward direction, substantially as and for the purpose or
purposes herein set forth and described.
In witness whereof, we, the said Charles Weightman Harrison and
Alfred Horatio Harrison, have hereunto set our hands and seals,
this Ninth day of September, in the year of our Lord One
thousand eight hundred and seventy-two.