Improvements in Gas Heating and Cooking Apparatus.
Year: 1886

page_text: Date of Application, 26th Nov., 1886.
Complete Left, 20th Aug., 1887.
Complete Accepted, 20th Sept., 1887
Improvements in Gas Heating and Cooking Apparatus.
I, OTTO WEHLE, Manufacturer of Gas cooking-apparatus, of Düsseldorf, Germany,
do hereby declare the nature of this invention to be as follows:-
My invention has for its object to regulate the gas-supply at the nozzle where it
forms a jet for drawing in the air necessary for combustion. Also to provide an
indicator adapted to show the consumption of gas or the heating effect at any position
of the regulating apparatus.
For regulating the gas supply I employ a screw spindle mounted in the axis of the
gas supply pipe in such a manner that the sectional area of the gas outlet may be
varied by screwing the spindle forward or backward, like the spindle of an injector ;
the advantage of this arrangement being that the quantity of the gas can be regulated
without changing its speed.
Between the stuffing box of the spindle and the handle is mounted a graduated
disc which revolves with the spindle and thus indicates by means of a stationary index
finger, the width or area of the gas outlet for different positions of the spindle, and
also the corresponding time required for boiling a quart of water.
If more than one revolution of the spindle is required to change the gas outlet from
zero to its full width, the numbers on the graduated disc may be arranged along a
raised spiral while the index finger is moveable along a fixed rod and is guided by
the raised spiral on the graduated disc. If the regulating spindle has only a longi-
tudinal motion, the graduated scale must indicate the axial displacement of the
spindle.
In the case of ring burners the flame is usually made to pass upward or outward
through slits, perforations or wire gauze. 1 prefer to produce a flat horizontal flame

page_text: passing from the circumference towards the centre of the burner, which may be
obtained by causing the combustible gas mixture to escape radially from a circular
horizontal opening into the air space in the centre of the ring burner. The upper
edge of the circular outlet is preferably made to overlap the lower edge, and the area
of the outlet may be rendered adjustable by making the annular burner of two
parts.
The flame issuing radially through the narrow circular outlet serves to heat the
burner and its contents.
Dated this 25th day of November 1886.
FAIRFAX & WETTER,
433, Strand, London,
Agents for the Applicant.

page_text: I, OTTO WEHLE, Manufacturer of gas cooking apparatus, of Düsseldorf, Germany,
do hereby declare the nature of my invention for IMPROVEMENTS IN GAS HEATING
AND COOKING APPARATUS, and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement :-
My invention is based on the facts that for perfect utilization and inodorous combustion
of gas, in gas-heating and cooking apparatus, the most favorable proportion between
the quantities of gas and air issuing from the burner should be maintained, whether
the flame (or the quantity of gas burned) is large or small, and also, that in the case
of apparatus supplied with gas through a suction nozzle, the supply of gas should
be regulated by altering the sectional area of the nozzle or of the current passing
through the same, in order to avoid any change of gas-pressure.
In the accompanying drawings Fig. 1 is a longitudinal section and Fig. 2 a plan
of a gas-burner and accessories, embodying my invention. Figs. 3 to 7 represent
modifications and details.
The burner is combined with a regulating apparatus consisting mainly of a gas-
nozzle a and a screw spindle b adapted to regulate the area of the gas-passage. This
spindle is guided by a stuffing box and carries outside of the same a ring & adapted
to slide on the spindle and to be fixed at the required point of its length by a set
screw, for the purpose of limiting the forward motion of the regulating spindle. The
sectional area of the gas inlet may thus be regulated from the centre by a longitudinal
motion of the spindle b without changing the gas pressure.
The apparatus represented by Figs. 1 and 2 is specially designed for cooking
purposes. The gas passing through the nozzle a such air through lateral openings e, e,
mixes with the same and passes into the burner proper A, from which the combustible
mixture escapes in a radial or nearly radial direction through a circular slot. For
this purpose the burner is provided with a circular cover or disc d attached to a central
post so as to form at the mouth of the burner only a narrow outlet having the
shape of a continuous horizontal circle or other curve.
In Figs. 4 and 5 the outlet is also a narrow slit having the shape of a continuous
horizontal circle, but the combustible mixture passes through the same radially from
the circumference towards the centre of the circle, and not from the centre towards
the circumference, as in Fig. 1. The arrangement of Fig. 4 produces a dish-shaped
flame and favors the complete combustion of the gas.
Figs. 6 and 7 represent rings burners of heating apparatus of the same shape as
shown by Figs. 1 and 4.
Having now particularly described the nature of my invention and in what manner
the same is to be performed, I declare, that what I claim is :-
In gas-cooking and heating apparatus:
1. The appliance for regulating the supply of gas through a suction nozzle (a),
comprising a longitudinally movable spindle (b), adapted to close the said nozzle
more or less and thereby to regulate the gas current.

page_text: 2. A regulating spindle b provided with an adjustible ring c for liberating the inward
motion of the said spindle.
3. A burner A having a central post supporting a disc or cover d adapted to form
a narrow slot or outlet having the shape of a continuous horizontal circle or other
curve.
4. A ring burner B, Figs. 4 and 5, the inside of which forms a continuous narrow
slot for the escape of combustible mixture.
5. A gas burner provided with a narrow outlet or slot forming a horizontal circle
or other closed curve and adapted to give the flame an approximately radial direction,
substantially as described and illustrated.
Deted this 10th dex of Ave 1987
FAIRFAX & WETTER,
433, Strand, London,
Agents for the Applicant.