Year: 1888

page_text: I, Professor Dr. HEINRICH MEIDINGER of Carlsruhe in the Grand Duchy of Baden,
Germany, do hereby declare the nature of this invention and in what manner the
same is to be performed, to he particularly described and ascertained in and by the
following statement :-
My invention relates to gas-stoves and more especially to gas or similar stoves of
that kind or class intended for heating purposes.
The chief object of my said invention is to provide a stove that will give a good
heating effect with gaseous fuel.
In carrying my said invention into practice I cause the hot products of combustion
of the fuel gas to ascend vertically through a narrow channel or passage, the trans-
verse section of which has the form of a slot, and which may be formed. by
approaching to each other, to a distance of about one inch more or less two metal
plates or sheets.
Owing to the large surfaces formed of good conductors of caloric offered by a
passage or tube of the shape above described to a given volume of the products of
combustion the said passage cools the hot gases or products of combustion to a
considerably higher degree than a wider passage, for instance a cylindrical one, having
its sides made of the same material. Stoves in which the gaseous products of combustion
are caused to ascend through a passage of slot shaped transverse section cannot
however be heated by means of the ordinary solid fuels for several reasons, amongst
others the unavoidable obstruction of the said passage by soot and ashes. It is true
that petroleum may be utilized for heating such stoves, provided that the formation of
soot be prevented by suitably constructed lamps; but, on the other hand, this arrange-
ment would render the service of the heater too complicated.
In my improved stove I combine the vertical passage or flue hereinbefore mentioned
at its lower extremity with a large chamber open at the bottom and acting as a
combustion chamber, and at its upper extremity with a large closed chamber in which
the products of combustion collect, and which is provided with a smoke pipe which
conveys the cooled gases into a chimney.

page_text: In a stove constructed in the above described manner the sides of the said passage
will always present identic temperatures at given heights, and from bottom to top the
temperature rapidly decreases. Thus for instance, in a stove of this kind, the
lowermost portion of the two sides may be heated nearly to red heat,. while, in
the height of about 3 feet, one may without danger touch the sides of the stove with
one's hands. It is a well known fact that a wide cylindric tube would, under similar
conditions, present at the beight named nearly the same temperature as at the lower
extremity.
My improved stove is constructed either of plane plates, or in the form of an
annular cylinder.
The said stove moreover may be provided with a surrounding casing to prevent
annoyance by reason of the heat radiating from the highly heated metallic surfaces.
In the accompanying drawing I have shown how my said invention may be
conveniently and advantageously carried into practice.
Figure 1 is a vertical central section of a cylindrical stove, the surrounding casing
being omitted.
Figure 2 is a horizontal section on the line a Figure 1.
Figure 3 is a vertical central section of a modification hereinafter described.
Figure 4 is a transverse section of the top portion of the stove.
Figure 5 is a horizontal section on line y, y Figure 4.
The stove rests on feet a between which the air freely enters the inner space of the
heater. By the outer cylindric side and the inner cylindric side c is formed an
annular slot-shaped passage. The distance between the said sides is from about } of
an inch to 1 inch and, but preferably less than half an inch; when formed more
than 1 inch and the calorific effect is greatly diminished. In order to maintain the
two sides 6 and c at the same distance apart either or both of them are provided with
radial ribs d, according to the dimensions of the stove from four to eight or other
suitable number of such ribs are provided.
The inner cylindrical side c is connected at its lower extremity with a conical
portion, whereby the annular combustion chamber is formed. Within this chamber
is arranged an annular gas pipe g provided with numerous burners, the intervals
between which are so small, that the gas streaming forth from all the said burners is
gradually lit as soon as the jet of gas near the fire-door h is lighted. This door h
may be glazed or provided with a mica panel so as to make the burning gas flames
visible from without.
At its top, the inner cylinder c terminates by a cylindrical portion of smaller
diameter and provided with a flange j, that connects it to the outer cylindrical side b.
In this manner, an annular chamber is formed, where the cooled products of combustion
collect before escaping through the smoke-pipe k. For the purpose of allowing the
gases, which enter the portion of the collecting chamber opposite to the exit pipe k,
to flow directly to this pipe, a passage or tube m is provided inside the cylinder i.
It will be readily understood that instead of forming the combustion chamber and
the collecting chamber for the products of combustion by narrowed portions of the
ends of the inner cylindrical side c, they may be formed by providing portions of a
larger diameter at either end of the outer tube b.
Within the cylinder c, which is open at its upper and lower extremities are arranged
one or more metal plates or sheets, as shown at n, this plate or plates extend from the
top of the cylinder c to the bottom edge of the conical portion f. On being heated,
the said plate or plates n adds to the surface, which imparte caloric to the current of
air continually passing through the cylinder c.
The improved stove is moreover provided with a head or corona o and a carved lid
or cover p.
Figure 3 shows a modification wherein both sides of the same are kept apart at an
unvariable distance by means of vertical ribs formed on or suitably attached to either
the one or the other side, or partly to one side and partly to the other side.
The above described gas stoves may be made either of sheet iron or of cast iron
or other suitable metal and they may be either enamelled or not.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is a
First. In a gas stove, the combination with a flue or passage of rectilinear or
circular form, a large combustion chamber, open at its lower extremity, gas burners
arranged within the said chamber, and a closed chamber communicating with the top
end of the said flue and with a chimney, substantially as and for the purposes
set forth.
Second. The substitution of suitable petroleum lamps for the gas burners,
substantially as described.
Third. In a gas stove, as set forth in the 1st claim, and being of circular form in
transverse section, a tube or passage m, by which the portion of the annular smoke
chamber, near the exit, communicates with the opposite portion of the said chamber,
substantially as and for the purpose described.
Fourth. In a gas stove, as set forth in the 1st claim, vertical ribs d, formed on or
fixed to either one or the other or partly to one and partly to the other of
the two sides forming the flat flue, of the stove, substantially as and for the purpose
set forth.
Fifth. In a gas stove, as set forth in the first claim, and being of circular form in
transverse section, plates n, extending through the whole height of the cylindric
hollow of the inner tubular side of the stove, and designed to increase the heated
surface along which sweeps the air, substantially as described.
Sixth. The combination with a gas stove, as set forth in the 1st claim, of a
surrounding casing, which prevents annoyance by the radiating heat, substantially as
described.