Cooking Utensils.
Year: 1892

page_text: Date of Application, 17th Nov., 1892
Complete Specification Left, 16th Aug., 1893-Accepted, 16th Sept., 1893
PROVISIONAL SPECIFICATION.
Cooking Utensils.
I, CHARLES EBENEZER CHALLIS of No. 30 Navarino Road, Hackney London
N.E. Machinist, do hereby declare the nature of my invention for COOKING
UTENSILS to be as follows:-
The object of my invention is to produce an enamel metal or earthenware vessel
which is protected from the violent and unequal molecular disturbance and con-
sequent fracture, caused by sudden changes of temperature, by a simple or
compound casing.
The utensil to some extent preserves the contents from burning although
sufficient heat may be obtained for boiling sugar, oil &c. &c.
The inner vessel when made of china, earthen or stoneware is, as far as possible,
of uniform thickness throughout except where certain beads or flanges are necessary
for strengthening or fixing.
The protective casing is preferably of metal with a flange bead or lugs for fixing
and for the earthen vessel to rest upon. The space between the vessel and
casing may be packed with sand, fire clay, fire brick, asbestos slag wool or other
non conducting material or compound, or by metallic plates, web or otherwise; the
idea being to cause the earthen vessel to be heated gradually, even when the
utensil is placed on a hot fire, and to distribute the heat nearly equally.
When the vessel and casing are fastened together the joint may be packed with
asbestos, slag wool or otherwise to prevent the sand or other material escaping.
The handle is put on the vessel or casing as may be deemed expedient; or, the
vessel and casing being detachable, each may be fitted with a handle; fibrous or
wired material is attached either outside the vessel or inside the casing, or some of
the other materials mentioned may be used either loose or shaped.
Dated the 17th day of November 1892
C. E. CHALLIS.
COMPLETE SPECIFICATION.
Cooking Utensils.
I, CHARLES EBENEZER CHALLIS of No. 30 Navarino Road, Hackney London
N.E. Machinist do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
The principle involved in my improved cooking utensils is that of the "sand-
bath" and the construction will be understood on reference to the accompanying
drawings:
Fig. 1 represents a lined vessel with part of side removed, A being the
earthenware lining, and B is the flange thereof; C is the outer casing of wrought
or cast metal, provided with the flange D and the handle F; G is the bead or
astragal for linking the lining and casing together, the ends of the astragal being
joined by interlocking tongues or otherwise; H is a fireproof packing between the
flanges to render the joint tight; I is the sand, asbestos slag wool, web or other
material for distributing the heat; K is the hole in casing through which it may
be filled.
Fig. 2 shows a similar vessel in section, with screws for connecting the lining and
casing instead of the bead or astragal, but where the casing is of wrought metal it
may be pressed into a groove in the lining and so avoid any other fixing.

page_text: Fig. 3 represents a metal lined vessel in section A being the metal lining, and
B the flange thereof which may be turned over the flange D of the casing C; F is
the handle of casing and K is the hole through which it may be filled with the
sand or other substance marked I.
In this type the vessel may be enamelled after the parts are fastened together,
or the lining may be of aluminium or other metal not readily attacked by any
substance used or evolved in the process of cooking, and the casing may be of a
commoner metal.
Handles are not always provided as shown, these being varied or omitted
according to the intended use of the vessel.
These cooking utensils are also specially suitable for electric heating the current
being applied to or in the inner vessel and the packing preventing radiation of heat
and also, when necessary, serving as insulation.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
Cooking utensils constructed in the manner and for the purpose set forth, and
shown in the accompanying drawings.
Dated the 16th day of August 1893.
C. E. CHALLIS.