IMPROVEMENTS IN COOKING APPARATUS
Year: 1875

page_text: LETTERS PATENT to August Lachmund, of Berlin, in the German
Empire, for the Invention of "IMPROVEMENTS IN COOKING APPARATUS."
Sealed the 1st February 1876, and dated the 6th August 1875.
PROVISIONAL SPECIFICATION left by the said August Lachmund at
the Office of the Commissioners of Patents, with his Petition, on
the 6th August 1875.
I, AUGUST LACHMUND, of Berlin, in the German Empire, do hereby
declare. the nature of the said Invention for "IMPROVEMENTS IN COOKING
APPARATUS," to be as follows:-
This Invention which relates to improvements in cooking apparatus
refers more particularly to that class of cooking stove wherein petroleum
is used as fuel and consumed by means of a wick. The Invention
consists in the application thereto of a round or hollow cylindrical wick
contained in an annular space, and capable of being moved upwards
and downwards by means of an ordinary feeding or pinching wheel.
The lower end of the wick dips into a petroleum receptacle, and the

page_text: inner wall of the annular space which contains it is carried through and
secured to the bottom of the said receptacle, thereby constituting a
funnel or chimney open to the atmosphere at top and bottom. The
outer wall of the annular space is stopped short about the upper part of
the petroleum vessel, and within a smaller chamber formed therein for
the collection of any petroleum gas that may arise from the lower
receptacle, such gas being conducted from the said chamber through a
tube, which also contains the spindle whereon is fixed the feeding or
pinching wheel before referred to.
To prevent the flame from closing at the top and also to regulate the
draught of air from below, the upper part of the wick case is provided
with a flame divider or regulator consisting of a round shield, the height
of which is made adjustable, according to the quality of the petroleum
used.
To supply the flame still further with oxygen a hollow conical case
fed with air from below surrounds the wick case, by which an air current
is caused to impinge upon the flame of the wick. The upper part of the
stove rests upon the same perforated plate which supports the aforesaid
conical chimney, and consists of a cylinder open or perforated at the top,
and upon which the cooking utensil is placed.
The lower part of the apparatus may be provided with feet or supports
and handles, by which it may be readily removed from place to place.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said August Lachmund in the Great Seal Patent Office
on the 5th February 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, AUGUSTUS
LACHMUND, of Berlin, in the German Empire, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of August, in the year
of our Lord One thousand eight hundred and seventy-five, in the
thirty-ninth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Augustus Lachmund, Her
special licence, that I, the said Augustus Lachmund, my executors, admi.

page_text: nistrators, and assigns, or such others as I, the said Augustus Lachmund,
my 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 COOKING APPARATUS," upon the condition (amongst
others) that I, the said Augustus Lachmund, my executors or adminis-.
trators, by an instrument in writing under my, 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 I, the said Augustus Lachmund, do hereby
declare the nature of my said Invention, and in what manner the same.
is to be performed, to be particularly described and ascertained in and
by the following statement in writing, and on reference to the accom-
panying Drawings, and to the letters of reference marked thereon, that
is to say:
This Invention which relates to improvements in cooking apparatus
refers more particularly to that class of cooking stove wherein petroleum
is used as fuel and consumed by means of a wick. The Invention
consists in the application thereto of a round or hollow cylindrical wick
contained in an annular space, and capable of being moved upwards
and downwards by means of an ordinary feeding or pinching wheel.
The lower end of the wick dips into a petroleum receptacle, and the
inner wall of the annular space which contains it is carried through and
secured to the bottom of the said receptacle, thereby constituting a
funnel or chimney open to the atmosphere at top and bottom. The
outer wall of the annular space is stopped short about the upper part of
the petroleum vessel, and within a smaller chamber formed therein for
the collection of any petroleum gas that may arise from the lower
receptacle, such gas being conducted from the said chamber through a
tube, which also contains the spindle whereon is fixed the feeding or
pinching wheel before referred to.
To prevent the flame from closing at the top and also to regulate the

page_text: with a flame divider or regulator consisting of a round shield, the height
of which is made adjustable according to the quality of the petroleum
used.
To supply the flame still further with oxygen a hollow conical case
fed with air from below surrounds the wick case, by which an air current
is caused to impinge upon the flame of the wick. The upper part of the
stove rests upon the same perforated plate which supports the aforesaid
conical chimney, and consists of a cylinder open or perforated at the top,
and upon which the cooking utensil is placed.
The lower part of the apparatus may be provided with feet or supports
and handles, by which it may be readily removed from place to place.
The great favor which the petroleum cooking stoves with flat burners
as hitherto in use have acquired in a short time has had the effect of
directing the efforts of manufacturers towards remedying the defects of this
apparatus and towards constructing a cooking stove which should be
easily handled, and the burner of which should be constructed so as to
effect the complete burning up of the petroleum rising to the surface of
the wick, and thereby rendering the burning flame thoroughly inodorous.
This problem has been completely solved by my round burner, which
burns without lamp glass in the open air without leaving a trace of
soot or smell.
And in order that this my Invention may be more fully understood I
will now proceed to describe the same with reference to the accom-
panying Drawings, of which Figure 1 is a side elevation of the
apparatus; Figure 2, a plan; Figure 3, a vertical cross section; and
Figure 4, a plan of the lower part of the apparatus.
This cooking stove consists of two parts, namely, of the lamp a and of
the stove o.
The burner itself consists of an inner tube c and of an outer tube f,
between which the wick which is opened or splayed out below can be
easily screwed up and down.
In order to supply the flame from inside with the necessary oxygen
the tube c is conducted through the lamp, and thereby the air is allowed
to penetrate to and to nourish the flame.
In order further to regulate this inner draft, and particularly in order
to prevent the flame from closing itself, there is fixed to the wire & the

page_text: flame divider or shield s, which may be screwed up and down, and may
thereby be put into a position corresponding with the quality of the
petrolcum.
The outer tube f is by means of a hermetically closing screw fixed to
the upper part of the lamp a, and may easily be taken off and screwed
on again when the wick is to be renewed. The wick itself is easily put in
motion by means of the two wheels fixed to the spindle h, at the end
of which there is a button or head l.
In order to produce in the oil receptacle a a certain draft, and thereby
to prevent as far as possible the gencration of petroleum gas or to carry
off such gas, the stopper J for the mouth (for pouring in) is provided.
with holes, and opposite the same the spindle is conducted into a
tube which enters into the outer tube f. Now, as the gases which
may be generated will collect at the point where the heat is produced
they will mostly collect below the outer tube f, about the spindle h, and
the wheels g. By means however of the cold air streaming in at J these
gases are driven out through the tube ¹, and there is produced in the
oil receptacle itself a certain cooling ventilation.
The stove o is separated from the lamp by a perforated bottom m.
The object of this perforated bottom is to protect the flame from the
influence of the draft, and also to prevent the heating of the lamp by
the stove o. On this perforated bottom is placed a conical tin casing p,
which is open at the top and serves to conduct the outer air streaming
in through the perforated bottom m to the flame. The influence of the
air is therefore by means of the flame divider s, which regulates the
inner draft, and by means of the tin casing p which lets in the outer air
regulated in such a way that the flame receives the utmost development
and burns without generating soot or smell quietly and firmly and with
intense heat.
And having thus fully described and ascertained the nature of this
Invention, I declare that I claim,―
Firstly. The conical casing p and the adjustable flame divider s, com-
hind and annunti
21

page_text: In witness whereof, I, the said Augustus Lachmund, have hereunto
set my hand and seal, this Second day of February, in the year
of our Lord One thousand cight hundred and seventy-six.
AUGUST LACHMUND. (L.S.)