IMPROVEMENTS IN PETROLEUM COOKING APPARATUSES
Year: 1876

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company, Patent
Agency, of Frankfort-on-the-Main, in the Empire of Germany, for the In-
vention of "IMPROVEMENTS IN PETROLEUM COOKING APPARATUSES." A.
communication from Adalbert Stark, residing at Munich, in the Kingdom
of Bavaria.
Sealed the 28th October 1876, and dated the 8th May 1876.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 8th May 1876.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Agency, of Frank-
fort-on-the-Main, in the Empire of Germany. "IMPROVEMENTS IN PETROLEUM
COOKING APPARATUSES." A communication.
My improved apparatus consists of a cooking pot of enameled-cast iron, provided
with two handles and a semi-circular top, on which rests a cover of strong tinned
sheet iron. In order that this .cover may be well secured on the pot the same
has two downwardly bent flanges, between which the rim of the pot fits. For
hermetically closing the groove formed by the said two flanges I provido a
packing ring of paste board impregnated with caoutchouc. The pot is placed on a
square-shaped wooden box, lined on the inner side with a non-conducting material
(a paste made of ash and soluble glass) and covered with sheet iron; over this box
is laid a similarly shaped box forming a cover.
This second box has a larger
diameter than the first one, so that there is a largo space left between the sides of
both boxes, in which space the air may freely circulate. The pot rests on four
angle irons screwed on the side of the wooden box. A frame made of three wooden
bars and provided with a wooden screw is laid over the box, embracing the same.
On the lower ends of the two lateral bars there are two hooks of sheet iron, which
can be hooked to two bolts, so that if the wooden screw of the frame is screwed
downward the box and the cover of sheet iron are pressed firmly on the cooking.
pot and the latter hermetically closed.
The petroleum lamp, which has a round or, a flat, burner, is arranged in the
support or foot on which the whole apparatus rests. The upper part of this support
can be removed, and is covered with a piece of the iron, in which a circular hole is
cut for the passage of the lamp, in consequence whereof fresh and cold air is
allowed to enter the apparatus in such quantity only as is required for the com-
[Price Gd.]

page_text: bustion. A valve is placed in the cover of sheet iron, which valve prevents an
excessive pressure in the cooking pot.
The advantages of this apparatus are:-
First Great economy of time and money, as the food is prepared in a much
shorter time than by the petroleum cooking apparatus heretofore used.
Second. If the flame of the lamp is properly regulated the apparatus can be
used in a sitting or bed room, as no steam or vapour escapes from the said
apparatus.
Third. The flame once properly regulated the apparatus wants no further attention
during the processes of cooking.
Fourth The food can be kent warm, even if the flame is extinguished for 5 to G
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Frank Wirth in the Great Seal Patent Office on the 4th November
1876.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Agency, of Frank-
IMPROVEMENTS IN PETROLEUM
fort-on-the-Maine, in the Empire of Germany.
COOKING APPARATUSES." A communication from Adalbert Stark, residing at
Munich, in the Kingdom of Bavaria.
This Invention relates to improvements in petroleum cooking apparatus, to which
the necessary heat is imparted by a petroleum or other lamp.
The said Invention is carried into practise as follows:-That is to say, I enclose
the culinary vessel in a surrounding box, into which the heat is introduced, and
which is provided on its inner sides with suitable brackets for the support of the
culinary vessel, so that thereby the cooking operation is accelerated and fuel saved.
I provide means for locking down the cover of the culinary vessel and other details
of construction, herein-after inore fully pointed out.
In the accompanying Drawing,
Figure 1 is my improved cooking apparatus partly in elevation and partly in
vertical section.
Figure 2 is a top view of the said apparatus, shewing the section lines a, b, c.
Figure 3 is a detail view of one side of the locking frame.
Figure 4 is a detail view of the safety valve.
Similar letters indicate corresponding parts throughout the Drawing.
The base or support of my apparatus is formed in two pieces, the lower piece a
on which the lamp stands is made preferably of iron, with four wooden feet, the
upper part A stands upon this, and in its turn is provided with a cover plate b, this
plate is perforated at its centre to allow the burner and upper part of the lamp C
to pass through, as is clearly shewn in Figure 1. B is a box or case of suitable size
and form supported on the foot A; this box, which I prefer to make of wood, may
be coated on its inner side with some non-conducting material, as shewn in the
Drawing; at its outer side the box B may be covered with sheet iron. To the
inner sides of the box B are screwed suitable brackets d for the support of the
culinary pot or vessel E that is placed upon such brackets within the box B and
covered with the outer cover D, and directly over the lamp and burner C, as is
clearly shewn in the Drawing.
The vessel E may be made of metal or other suitable material, and should be of
somewhat smaller diameter than the inner diameter of the box B, so that an air
space is left between the two.
The vessel E is provided with a cover e that can be closed hermetically upon the
same by means of the straddle frame F and screw h, the lower ends of the frame F
are provided with two metal hooks to engage the pins g, g, thus allowing the box
cover D and pot cover e to be tightly screwed down.

page_text: A safety valve is provided, as shewn in Figures 1 and 4 of the accompanying.
Drawing, air holes f, f, f, f, Figures 1, 2, and 4, being made in the screw plate for
the
escape of steam.
In using the said apparatus the substanco to be cooked is first placed in the
vessel E, which is thereupon closed and placed upon the brackets & within the
box B, the cover D is now placed upon the box in such a manner that it will rest
on the pot cover o; the frame F is now adjusted with its hooks around the pins g,g,
and the whole screwed tight with the screw h; the flame of the lamp C is now
ignited, and the heat confined within the box will embrace the vessel on all sides,
thus greatly accelerating the cooking operation.
The said apparatus is entirely smokeless and needs no further attention if onco
properly started.
Having thus fully described the said Invention, and the manner of performing
the same, I wish it understood that I claim,―
First. In a portable cooking apparatus the combination of the outer box B, which
carries the inwardly projecting brackets d, with the cover D, all arranged to support
and embrace the culinary vessel E, as above set forth.
Second. The combination of the straddling frame F and screw h with the cover D,
box B, and culinary vessel E, all arranged to press the box cover D upon the pot
cover e, as above set forth.
Third. The combination of the support A and lamp C with the box B, cover D,
and brackets d, and of these parts' with frame F a culinary. vessel E, all arranged as
above set forth.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand and
seal, this Twenty-eighth day of October, in the year of our Lord One
thousand eight hundred and seventy-six.