Im- PROVEMENTS IN APPARATUS FOR ROASTING, BAKING, OR COOKING BY GAS."
Year: 1872

page_text: LETTERS PATENT to George Goldsmith and James Dilkes, both of
Leicester, in the County of Leicester, for the Invention of "Im-
PROVEMENTS IN APPARATUS FOR ROASTING, BAKING, OR COOKING BY GAS."
PROVEMENTS IN APPARATUS FOR ROASTING, BAKING, OR COOKING BY GAS."
PROVISIONAL SPECIFICATION left by the said George Goldsmith and
James Dilkes at the Office of the Commissioners of Patents, with
their Petition, on the 24th October 1872.
We, GEORGE GOLDSMITH and JAMES DILKES, both of Leicester, in the
County of Leicester, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN APPARATUS FOR ROASTING, BAKING, OR COOKING BY GAS,"
to be as follows:-
This Invention is a modification of apparatus for heating by gas for
which Letters Patent, No. 2063, dated Aug. 4, 1871, were granted to us,
and consists in arranging the apparatus so as to adapt it for roasting
coffee and other substances requiring similar treatment to fit it for con-
sumption, roasting or baking meat, and the preparation of food. For

page_text: these purposes a rectangular or other suitably shaped chamber is formed
of sheet iron mounted upon a cast-iron bottom or stand and furnished
with a hinged lid. The case has a number of holes pierced in it for the
admission of air. Within the chamber and fitted to the upper part of it
is a cast-iron trough partially lined with fire-clay or fire-proof cement,
the bottom of the trough having an opening therein. Beneath the
opening is fixed a burner suitable for the combustion of a mixture of
atmospheric air and gas, the gas being admitted at the bottom of the
burner from a pipe which extends to the outside of the chamber, where
it is fitted with a valve. A lever is so arranged that one end of it
projects above the flange of the cast-iron trough, while the other is
connected to the valve before-mentioned. A spring is so placed within
the chamber as to keep the valve in such a position as to admit but a
very small quantity of gas to pass to the burner except when the lever
before alluded to is applied to it.
A cylinder made of sheet metal with an opening in its periphery, and
fitted with a flap valve covering, is made to revolve in the trough upọn
its axis, which works in bearings formed on the flange of the said trough.
The cylinder has also another opening in its periphery fitted with a guard
on the inside so as to prevent any material contained therein from
escaping while the cylinder revolves in one direction, but permits a small
quantity to drop out when moving in the opposite direction. Hand or
other suitable power may be employed to give motion to the cylinder.
The whole of the top is covered by a suitably shaped lid provided with
an opening for the escape of any steam, vapour, or effluvia.
The way in which the apparatus is used is as follows:-The gas is
lighted, and the coffee or other material to be roasted is put in the
cylinder through one of the openings. The cylinder is then placed in
position in the trough and the lid closed. The closing of the lid has the
effect of producing pressure upon the projecting end of the lever, which
opens the valve and admits a full supply of gas or such an amount as is
necessary to produce the requisite heat. The cylinder is then made to
revolve until the material within it is sufficiently roasted, a condition
which is ascertained by turning the cylinder in the opposite direction,
and inspecting a few grains, or a small portion which will fall out of the
opening before referred to.
When the meat or other analagous substances are to be roasted, baked,
or otherwise cooked it is necessary to employ another cylinder or chamber.

page_text: specially adapted for the purpose, the meat being made to rotate regu-
larly, to be turned only at intervals or as occasion may require.
In either case the full consumption of gas is limited to the time in
which the coffee, meat, or other substance is submitted to its action, for
on the removal of the lid the amount of gas consumed is reduced to a
minimum or only just sufficient to keep it alight.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Goldsmith and James Dilkes in the Great
Seal Patent Office on the 24th April 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, GEORGE
GOLDSMITH and JAMES DILKES, both of Leicester, in the County of
Leicester, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fourth day of October, in the
year of our Lord One thousand eight hundred and seventy-two, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said George Goldsmith and James Dilkes,
Her special license that we, the said George Goldsmith and James Dilkes,
our executors, administrators, and assigns, or such others as we, the said
George Goldsmith and James Dilkes, our executors, administrators, 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 ROASTING,
BAKING, OR COOKING BY GAS,” upon the condition (amongst others) that we,
the said George Goldsmith and James Dilkes, our executors or adminis-
trators, by an instrument in in writing under our, or their, or one of their
hands and seals, 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 George Goldsmith and James
Dilkes, do hereby declare the nature of the said Invention, and in

page_text: what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement, reference being had
to the accompanying Drawings, and to the letters and figures marked
thereon, that is to say :-
This Invention is a modification of apparatus for heating by gas, for
which Letters Patent, No. 2063, dated Aug. 4, 1871, were granted to us,
and consists in arranging the apparatus so as to adapt it for roasting
coffee and other substances requiring similar treatment to fit it for con-
sumption, roasting or baking meat, and the preparation of food. For
these purposes a rectangular or other suitably shaped chamber is formed
of sheet iron mounted upon a cast-iron bottom or stand and furnished
with a hinged lid. The case has a number of holes pierced in it for the
admission of air. Within the chamber and fitted to the upper part of
it is a cast-iron trough partially lined with fire-clay or fire-proof cement,
the bottom of the trough having an opening therein. Beneath the
opening is fixed a burner suitable for the combustion of a mixture of
atmospheric air and gas, the gas being admitted at the bottom of the
burner from a pipe which extends to the outside of the chamber, where
it is fitted with a valve. A lever is so arranged that one end of it
projects above the flange of the cast-iron trough, while the other is
connected to the valve before mentioned. A spring is so placed within
the chamber as to keep the valve in such a position as to admit but a
very small quantity of gas to pass to the burner except when the lever
before alluded to is applied to it.
A cylinder made of sheet metal, with an opening in its periphery and
fitted with a flap, valve, or other suitable covering, is made to revolve in
the trough upon its axis, which works in bearings formed on the flange
of the said trough. The cylinder has also another opening in its peri-
phery fitted with a guard on the inside so as to prevent any material
contained therein from escaping while the cylinder revolves in one direc-
tion, but permits a small quantity to drop out when moving in the
opposite direction. Hand or other suitable power may be employed to
give motion to the cylinder. The whole of the top is covered by a
suitably shaped lid, provided with an opening for the escape of any
steam, vapour, or effluvia.
In order that the foregoing may be more easily understood Drawings
are attached hereto, of which the following is a description

page_text: Fig. 1 is a front elevation; Fig. 2, a side view partly in section; and
Fig. 3, a plan of the apparatus, with the cover and roasting cylinder
thrown back, thereby exposing the interior of the heating chamber.
In Fig. 1, A is the exterior case; B, the cover hinged at or near C;
D, the handle for lifting the same; and E, the handle for lifting the
roasting cylinder, which is pivotted at F and is supported by a frame"
hinged also at or near C, the same as the cover. G is the inlet for the
gas, and H a stop cock. I is a fitting containing a valve, which is fixed.
to the spindle J. When the apparatus is not in full operation the valve
is nearly closed by a spring K, seen in Fig. 2. If however the valve is
made to fit close, then a permanent leak or small gas-way is made in it
so as to allow sufficient gas to flow to the burner L as will just keep it
alight. But when any substance is undergoing the operation of roasting
the cover is closed, and in its closing it presses upon the end of a lever M,
which raises the spindle through the intervention of the arm N. The
valve is thus opened, and a free passage for the gas is effected. The
burner L is one adapted for burning a mixture of gas and air, the air
entering with the gas at the point O. P is the roasting cylinder showing
the opening from which the coffee or other substance may be removed
to test its condition; and Q, shown in Fig. 3, is an opening for intro-
ducing the material to be operated upon.
R is a slit in the heating
chamber through which the jets. of gas impinge upon the roasting
cylinder. S is a crank handle, by which the cylinder P is made to
revolve.
The way in which the apparatus is used is as follows:-
_ The gas is
lighted, and the coffee or other material to be roasted is put in the
cylinder through one of the openings, the cylinder is then placed in
position in the trough, and the lid closed. The closing of the lid has
the effect of producing pressure upon the projecting end of the lever,
which opens the valve and admits a full supply of gas, or such an
amount as is necessary to produce the requisite heat. The cylinder is
then made to revolve until the material within it is sufficiently roasted,
a condition which is ascertained by lifting the cylinder from the trough,
turning the cylinder in the opposite direction, and inspecting a few
grains or a small portion which will fall out of the opening before
referred to.
When meat or other analagous substance are to be roasted, baked, or
otherwise cooked, it is necessary to employ another cylinder or chamber

page_text: specially adapted for the purpose, the meat being made to rotate regu-
larly, to be turned only at intervals, or as occasion may require. This
cylinder if made water-tight will also serve as an exellent vessel in
which boiling or stewing may be carried on.
In either case the full consumption of gas is limited to the time in
which the coffee, meat, or other substance is submitted to its action, for
on the removal of the lid, the amount of gas consumed is reduced to a
minimum, or only just sufficient to keep it alight.
Having now described and particularly set forth the nature of this
Invention, and the manner in which the same is or may be used or
carried into effect, we would observe in conclusion that we do. not
confine or restrict ourselves to the precise details or arrangements which
we have described or referred to, as variations may be made there-
from without deviating from the principles or main features of this
Invention; but what we consider to be novel and original, and therefore
claim as the Invention secured to us by the herein-before in part recited
Letters Patent is,―
Firstly. The construction of apparatus for roasting, baking, or cooking
by gas, substantially as described.
And, secondly. For the arrangement whereby the quantity of gas 1
consumed is diminished while nothing is being subjected to its heat, but
is increased immediately the apparatus is brought into active operation.
In witness whereof, we, the said George Goldsmith and James
Dilkes, have hereunto set our hands and seals, this Twenty-
fourth day of April, in the year of our Lord One thousand eight a
hundred and seventy-three.