Year: 1897

page_text: I, LOUIS WOLFF, of 10, Zeughausstrasse, Siegburg, in the Empire of Germany,
Engineer, do hereby declare the nature of this invention to be as follows:-
.
This invention has for its object an incandescent gas lamp having both the
appearance and also the peculiarities and advantages of the electric light and being
in addition considerably cheaper to use.
In the accompanying drawings, Figures 1 and 2 show two forms of construction
which only differ in the different attachment of the incandescent body.
A Bunsen burner a through which the lighting gas is conveyed by means of a
tap b resembling an electric switch, is provided with a long and narrow tube c,
the upper end of which forms the actual burner head d. This produces either
a pear shaped flame as in Figure 1, or a spherical one as in Figure 2.
The incandescent body e is suspended in such a way that it cannot fall off the
lamp when in a reversed or inclined position. This result is preferably attained by
first suspending the incandescent body as in Figure 1 on a fork of the kind at present.
employed and then so forming its lower edge that it embraces the tulip shaped
burner.
In Figure 2 the incandescent body is prevented from falling off by being drawn
over a thin spherical fabric or framework of incombustible material, such, for
instance, as platinum or the like, or by being burnt onto the same at first. The
attachment of this spherical support to the head of the burner will be sufficient for
fixing the incandescent body. A glass globe f is placed over the incandescent body
and is provided with a suitable number of holes g to allow of the escape of the gases
of combustion, and is screwed into a suitable socket or holder arranged at the foot
of the burner.
In order to make this lamp as far as possible resemble an electric incandescent
lamp, the pipe serving for supplying the gas may be wrapped similarly to the
conducting wires, coloured globes may also be used for decorative purposes and
especially for obtaining illuminating effects which hitherto were only possible with
electric incandescent lamps.
The new technical effects which are attained by the present invention are as
follows:-
1. The working and installation is considerably cheaper than that of the electric
light;
2. The transportability of the lamps and the possibility of using them in any
position allows of their use in shop window decorations and for other effects of
illumination which could only be obtained hitherto by means of electric light ;
3. Any danger of fire is entirely prevented;

page_text: 4. The replacement of the incandescent bodies is, on account of their small
dimensions, considerably cheaper than in the incandescent lamps hitherto
employed.
Dated this 25th day of January 1897
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
.
An Improved Incandescent Gas Lamp.
I, LOUIS WOLFF formerly of 10 Zeughausstrasse, Siegburg, but now of 23 Linden
Strasse, Berlin, in the Empire of Germany, Engineer, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This invention relates to means for making incandescent gas lamps on Auer's
system applicable in a similar way to electric incandescent lamps more particularly
for illuminating and similar purposes for decorative lighting, for which the
incandescent gas light has hitherto not been able to be adopted owing to its peculiar
construction, The invention consists in surrounding the incandescent body of an
incandescent gas lamp on Auer's system, instead of as hitherto by an open glass
cylinder together with some sort of bell or globe or the like, merely by a closed glass
casing but having small air openings, said glass casing being preferably of a pear
shape as in the case of electric incandescent lamps. By this peculiar arrangement,
which is entirely new for Auer's incandescent gas lamps, namely by placing the same
in closed glass cases provided with small air openings, the said incandescent gas
light is applicable for purposes precisely the same as electric incandescent lamps, as
the glass casings can be arranged in any suitable position round the incandescent
inantle, which must always be placed in a vertical position, and consequently it is
possible to imitate or replace the electric incandescent lamp which may be arranged
in any suitable position by such an improved gas incandescent lamp, as is necessary
for illumination and the like purposes, but which was hitherto impossible, and
further by the peculiarity of the glass casing being a closed one the danger of fire
which has always been present with other gas lights is removed, and the danger of
the easily broken mantle being damaged, which is especially great in the short
bulging cylinders open at the top which have already experimentally been employed
for similar purposes is avoided.
Experiments have already been made to surround a gas light with a glass casing
similarly to an electric incandescent light but never with the Auer incandescent
gas light but always with gas lights or lamps of other systems. Such attempts did
not reach the object of the present invention of creating a valuable replacement for
the electric incandescent light by means of gas incandescent light, as the illuminating
power of such la ups did not by a long way reach that of an incandescent electric
lamp of similar size. The important advantage obtained by the present invention
as against such lamps consists in that by the former the incandescent gas light on
Auer's system (with incandescent mantle) is made capable of being suspended in the
manner of an electric incandescent light and thereby a means of utilization is opened
to this incandescent gas light with its advantageous properties which was not hitherto
possible and this improvement over the former lamps is attained by providing the
glass casing with small air openings, by means of which alone it is possible to obtain
the burning of an Auer incandescent gas light in such a casing. It is the original
idea of the inventor to arrange Auer's incandescent gas light in a closed glass casing
provided with small air openings, and he has found for the first time that an

page_text: incandescent gas lamp thus arranged gives a faultless illumination and acts perfectly,
which has not hitherto been recognized or deemed possible by other experts.
The invention is shown in the accompanying drawing in various forms of
construction :-
Figure 1 shows an incandescent gas lamp provided with the improved glass casing
having small air openings in which the glass casing is arranged pointing vertically
upwards;
Figure 2 shows a similar lamp with the glass casing arranged vertically downwards;
Figure 3 a similar lamp with the glass casing pointing upwards in an inclined
position;
Figure 4 the same with the glass casing pointing downwards in an inclined
position;
Figure 5 shows a modification of the means for supplying the air.
The glass casing inclosing an incandescent mantle 6 of Auer's pattern, which
glass casing may have preferably a pear shape, is attached in any suitable manner to
the incandescent gas lamp, preferably in a socket c arranged on the same. In the
vertical form of arrangement shown in Figure 1, the air necessary for combustion
passes to the flame in the ordinary manner through openings & provided in the burner
or in the holder c. These openings d may for instance be situated at the bottom
of the holder as in Figure 1 or at the side of the same as shown in Figure 5.
In the latter case suitable openings a¹ must be provided in the neck of the glass
casing a, which neck penetrates into the holder. To allow of the escape of the gases
of combustion, small air openings e are arranged at the top of the glass globe or
casing a. These air openings may be suitably arranged without essentially affecting
the action; they may be placed more at the side of the glass casing or globe a
instead of at the top, but it is preferable to place them at the top. In the form of
construction shown in Figure 2, the action is reversed, the openings e arranged at
the point of the glass globe or casing e serving for the admission of air for the
combustion, whilst the gases of combustion escape through the openings & formed in
the holder c. When the lamps are placed in an oblique or inclined position as shown
in Figures 3 and 4, the glass casing is preferably provided with holes e and el
respectively above and also beneath the flame, the lower ones e serving for supplying
air for the combustion and the upper ones e¹ for carrying off the gases of combustion,
but as shown in Figure 3 the supply of the air for combustion and in Figure 4 the
carrying off of the gases of combustion may also take place by means of suitable
openings in the holder or socket. The position and arrangement of the air openings
in the glass casing may thus be altered to suit circumstances.
The construction of the incandescent gas light burner is otherwise quite ordinary.
In the drawings, f is the mixing nozzle of a Bunsen burner and 9 is a tap arranged
below the same in Figure 1 or above the same in Figures 2 and 4, which tap
resembles an electric switch.
In the forms of construction shown in Figures 2, 3, and 4 the pipe i carrying the
burner head h and supplying the mixture of gas and air is bent in such a way that
the burner head and the incandescent mantle always stand vertically upright and
therefore the mantle can be simply suspended in the ordinary manner over the
burner head without requiring to be specially supported or without any special
arrangement being necessary in the incandescent gas light lamp.
The glass casings or globes herein before described capable of being attached to the
incandescent gas light lamps in any position may be made in the ordinary manner
wholly or partially of ground glass, coloured glass or the like so that by means of
the same it is possible to produce with an Auer's incandescent gas light any
illuminating effect obtained by means of electric incandescent lights.
Naturally the invention is intended and is applicable for all kinds of incandescent
light in which incandescent lamps on Auer's system are employed, as well as for
spirit, petroleum or other incandescent lamps.
Having now particularly described and ascertained the nature of my said

page_text: invention and in what manner the same is to be performed, I declare that what I
claim is :-
In Auer's or like incandescent lamps, a closed pear or otherwise shaped glass
casing or globe arranged around the mantle, replacing the cylinder, bell or the like
on the lamp, and provided at suitable places with openings e e¹ for the inlet and
outlet of air, with the object of rendering it possible to imitate or replace electric
incandescent lamps by Auer's or like incandescent lamps in any suitable position
which inay be given to such lamps, substantially as hereinbefore described.
Dated this 22nd day of October 1897.
W. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.