IMPROVEMENTS IN APPARATUS FOR COOKING FOOD AND KEEPING THE SAME WARM communi- cated him ab by.
Year: 1883

page_text: LETTERS PATENT to Albert Ferdinand Link, of the firm of M. Bauer and
Co., Civil Engineers and Financial Agents, of 6 Union Court Chambers
Union Court London, E.C. for an Invention of "IMPROVEMENTS IN
APPARATUS FOR COOKING FOOD AND KEEPING THE SAME WARM communi-
cated to him from abroad by Franc Desplas of Conques France.
"
PROVISIONAL SPECIFICATION left by the said Albert Ferdinand Link at
the Office of the Commissioners of Patents on the 27th January 1883.
ALBERT FERDINAND LINK of the firm of M. Bauer & Co. Civil Engineers and
Financial Agents of 6 Union Court Chambers, [Union Court] London EC
IMPROVEMENTS IN APPARATUS FOR COOKING FOOD AND KEEPING THE SAME
WARM, a communication to me from abroad by Franc Desplas, of Conques, France,
The object of my sd invention is to provide a convenient arrangement of apparatus
for cooking food by means of the specific & latent heat of steam and for keeping
the same warm for many hours without requiring an additional supply of heat;
such apparatus combining considerable economy with great convenience portability
& simplicity.
My said invention consists of two vessels, (an inner and an outer) of a cylindrical
or other suitable form, and preferably of metal. The inner vessel receives the food
which is required to be cooked or kept warm, and is considerably smaller than the
outer vessel. The space between the inner and outer vessels is packed with any
suitable nonconducting material in order to prevent loss of heat by conduction, such
as asbestos, amianthus, wool slag, saw dust, or other suitable material.
The inner vessel is used as a cooking vessel or boiler, and is fitted with a moveable
cover or lid, which is made air & steam tight by means of thumb screws or
studs & muts, the flanges being thereby held in close contact, with asbestos or
other packing placed between the contact surfaces. The lid is also fitted with a
spring or other safety valve to prevent rupture of the vessel from internal pressure
of steam. Two folding handles are fitted to the inner vessel or boiler one to the
body and theother to the lid, for convenience of lifting.

page_text: The outer vessel is also fitted with a lid or cover by preference hinged on one
side and having a hasp on the other side which fits an outside staple. This lid is
also thickly packed with nonconducting material on its underside, and the outer
vessel has a handle conveniently fitted for carrying the same.
The food to be cooked is placed in the boiler with a sufficient quantity of water,
after removal from the outer vessel; the lid or cover of the boiler is then screwed
down; heat is applied thereto by its being placed upon a fire, or by any other
ordinary means. After a short time steam will be produced therein until by its
pressure it lifts the safety valve. The boiler may then be taken from the
fire & placed in the outer vessel, the cover of which is immediately closed upon
the inner vessel. The sensible & latent heat of the steam is by these means
prevented from becoming dissipated or lost by conduction & such heat is utilised
in cooking the food, and also in keeping the same warm for many hours, the
operation of cooking being performed by means of the latent heat of the steam.
It is obvious that the forms of the vessels & the description of nonconducting
material may be greatly varied without departing from the principle of my said
invention.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Albert Ferdinand Link in the Great Seal Patent Office on the
26th July 1883.
ALBERT FERDINAND LINK of N° 6 Union Court Chambers Union Court in
the City of London, Civil Engineer and Financial Agent. "IMPROVEMENTS IN
APPARATUS FOR COOKING FOOD AND KEEPING THE SAME WARM " a communica-
tion to me from abroad by France Desplas, of Conques France.
The object of my said Invention is to provide a convenient arrangement of
apparatus for cooking food by means of the specific latent heat of steam, and for
keeping the same warm for many hours without requiring an additional supply of
heat, such apparatus combining considerable economy with great convenience
portability and simplicity.
My said Invention consists of two vessels (an inner and an outer) of a cylindrical
or other suitable form, and preferably of metal. The inner vessel receives the food
which is required to be cooked or kept warın, and is considerably smaller than the
outer vessel. The space between the inner and outer vessels is packed with any
suitable nonconducting material in order to prevent loss of heat by conduction such
as asbestos, amianthus, wool slog, saw dust or other suitable material.
The inner vessel is used as a cooking vessel or boiler, and is fitted with a
moveable cover or lid, which is made air and steam tight by means of thumb screws
or studs and nuts, the flanges being thereby held in close contact, with asbestos or
other packing placed between the contact surfaces The lid is also fitted with a
spring or other safety valve to prevent rupture of the vessel from internal pressure
of steam. The folding handles are fitted to the inner vessel or boiler, one to the
body and the other to the lid, for convenience of lifting.
The outer vessel is also fitted with a lid or cover, by preference hinged on one
side, and having a hasp on the other side which fits an outside staple. This lid is
also thickly packed with nonconducting material on its underside, and. the outer
vessel has a handle conveniently fitted for carrying the same
The food to be cooked is placed in the boiler with a sufficient quantity of water
after removal from the outer vessel the lid or cover of the boiler is then screwed
down, heat is applied thereto by its being placed upon a fire, or by any other
ordinary means. After a short timo steam will be produced therein until by its
pressure it lifts the safety valve. The boiler may then be taken from the fire and
placed in the outer vessel, the cover of which is immediately closed upon the inner
vessel. The sensible and latent heat of the steam is by these means prevented
from becoming dissipated or lost by conduction, and such heat is utilised in cooking
the food and also in keeping the same warm for many hours, the operation of
cooking being performed by means of the latent heat of the steam.
It is obvious that the forms of the vessels and the description of nonconducting
material may be greatly varied without the principle of my said Invention
Having thus stated the nature of the said Invention I will proceed more particu-
larly to describe in what nature the same is to be performed by the aid of the
accompanying drawings in which similar letters of reference indicate corresponding
parts in the several figures.
Fig 1 is an external view of the apparatus-Fig:-2 is a sextional elevation of
the same-Fig: 3 is a side view of the lid or cover B of the outer vessel A-Fig :-4
is a view of the inner vessel K without its cover Fig:-5 is another view of the
inner vessel with the lid or cover attached and Fig:-6 is a top view of the lid M
A is the external cylinder formed of metal or other suitable material and furnished

page_text: with a lid B which is stuffed at R with felt amianthus or other suitably non-
conducting material and fixed to the external vessel A by the frame C and which
is closed by a latch D in which is the slot I to receive a staple H fixed to the
Cylinder A-The Cylinder is also provided with a bent rod E having a handle F
fitted to the staples G for facilitating its carriage and transport. The interior of
this cylinder is provided with a thick stuffing or packing J formed of any suitable
nonconducting material. In the position shewn in Figs: 1 and 2 is placed the
boiler K after being taken from the fire that is to say, as soon as the steam escapes
through the valve N near the centre of its lid. When placed in this receptacle
and while hot the boiler and its contents being no more in contact with the
surrounding air the heat is retained for a considerable time the result of this
arrangement is that both the sensible and latent heat are retained and the process
of cooking the food is continued and the heat and vapour retained in the boiler
become practically the generator. The boiler K consists of a hollow cylinder
formed of copper or other metal tinned or enamelled or otherwise rendered
innocuous to food
The upper flange L is flat, and to which is fitted a lid M, which by means of the
screws or any other suitable fastening seals the vessel hermetically-This lid M
has an opening near the centre covered with a spring valve O for the escape of
steam while the boiler is being heated to prevent its bursting
When the boiler has been sufficiently heated which is indicated by the escape of
steam from the safety valve, it is then removed from the fire by the handle M₁ and
placed immediately in the cylinder A, as above described, where the cooking process
is accomplished alone through the influence of the heat retained in the water and
steam contained in the boiler, and which very gradually condenses and continues
the process of cooking, as before mentioned-The lid of the boiler has a handle F to
facilitate its removal-The economy of fuel and time resulting from this application
will be easily understood, because, as soon as the steam appears the boiler is taken
from the fire and placed in the insulator A where it remains, until wanted; the
further application of external heat is unnecessary-The cooking continues
without requiring attention and the food is also kept warm from 8 to 10 hours
This Invention is not confined merely to the cooking of food but is also applicablo
to any other purpose where a prolonged retention of heat is required and where
the latent heat in the steam acquired in the first instance can continue to replace
the heat which would otherwise be necessary
It is obvious that my Invention is capable of being greatly modified without
departing from the nature of the same.
Having thus particularly described and ascertained the nature of my said
Invention and the manner in which the same is to be performed. I claim
The means and appliances for utilising the sensible and latent heat of the water
and steam in the cooking of food or analogus operations substantially as described
and shewn on the drawings
In witness whereof I the said Albert Ferdinand Link have hereunto set my
hand and seal this twenty-fifth day of July in the year of our Lord One thousand
eight hundred and eighty three.
ALBERT FERDINAND LINK
(14.5.)