Year: 1886

page_text: Date of Application, 1st Sept., 1886.
Complete Left, 30th Apr., 1887.
Complete Accepted, 24th June, 1887.
I CARL SEEL of 16, Christstrasse of Charlottenburg near Berlin, in the Kingdom
of Prussia, German Empire, Technician do hereby declare the nature of this invention
to be as follows:-
The improvements in glow-lamps described hereinafter relate to the arrangement of
the carbon-threads in the lamp.
They are arranged in such a way, that several of them, which terminate in separated
contacts and which have therefore separate current-conductors, are connected in one
common point from which they diverge like rays to their separated contacts.
A material point in this arrangement is that this connecting-point of the carbon-
threads offers less resistance to the electric current than one or more of the threads
themselves do and consequently it is not made to glow as they are. The manner of
using this arrangement is as follows:
The electric current is led either through two of the carbon threads and they may
either be beside or opposite each other, or it is conducted through several of the
carbon threads at the same time. The thickened connecting-point allows that any two
of the carbon-threads be connected with each other when the respective contact-ends
are connected with the electric current, and it likewise permits that 4 or 6 of the
carbon-threads are made to glow at the same time, if all their contact ends are likewise
connected with the electric-current.
By means of this arrangement it is possible not only to lengthen the burning period
of the lamps as long as may be desirable by simply leading a greater number of
carbon threads from the common connecting point to their separate contacts and by
burning two and more of them successively, but the lighting power of the lamp can
likewise be augmented by burning several of the carbon-threads at the same
time.
The carbon-threads can be connected at their common connecting-point by luting
them together, but the best method of producing a number of connected carbon-
threads is to take some interwoven fibrous material, such as silk, leather etc. and to cut
it out in a particular shape described hereinafter and then to carbonize the threads and
their connecting-point altogether.

page_text: But there is still another novelty relating to the platina-wire soldered into glass-
shade of the lamp with the contact screws. The space in the lamp has hitherto
been filled up with gypsum or some other non-conductor, but in the present invention
it is left empty and filled by air alone, by which means a far better and surer
insulation is obtained, and more especially so as any moisture, that may happen to
get in, may escape through openings.
The way of making this glow-lamp is as follows:
A piece of silk, sheepskin or other fibrous material is taken and the before-mentioned
particular shape is cut out, that is in other words a thick centre-piece is cut out with
several long strips hanging to it. For the purpose of carbonizing the fibres of the
shape thus cut out it is laid on a carbon-cylinder in the shape of a sugar-loaf.
Recesses corresponding exactly with the piece of silk just cut out are previously made
in the carbon-cylinder and into them the shape is laid. The silk shape fits into the
carbon-cylinder so completely, that no projections are to be seen on the latter. A
hollow shade that fits exactly on to the carbon-cylinder is then taken and shoved on
to the latter, after which the carbonizing is carried out in the well-known manner.
The silk shape is then removed and prepared so as to have the proper resistance.
The manner of preparing it is the same as that, for which the same inventor has
already obtained letters patent, and is as follows: the carbonized silk-threads together
with their connecting-piece are coated over with mineral salts and a gum and dipped
in a parafine bath and carbon is then precipitated on them by means of the electric-
This preparation is not the subject of the present patent, but it
is only mentioned herein for the sake of greater clearness and completeness.
The fourfold or manifold carbon-thread is then inserted in the lamp, fastened
to the platina-wires and the lamp is closed. The platina-wires are provided
with eyes and to these the contact-wires that lie free in a metal-pipe are
fastened.
current.
The air
can therefore continually play round these contact-wires, by means
of which the lamp is kept cool and a good insulation is obtained.
1002
A. KUHNT & R. DEISSLER,
Berlin, Germany, Alexanderstr., 70,
Attorneys.

page_text: I CARL SEEL of 16, Christstrasse of Charlottenburg near Berlin in the kingdom
of Prussia, German Empire, Technician 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:-
The improvements in glow-lamps described hereinafter relate to the arrangement of
the carbon-threads in the lamp.
They are arranged in such a way, that several of them which terminate in separated
contacts and which have therefore separate current conductors are connected in one
common point from which they diverge like rays to their separated contacts.
A material point in this arrangement is that this connecting-point of the carbon-
threads offers less resistance to the electric current than one or more of the threads
themselves do and consequently it is not made to glow as they are. The manner of
using this arrangement is as follows:
The elastic current is led either through two of the carbon-threads and they may
either be beside or opposite each other, or it is conducted through several of the
carbon-threads at the same time. The thickened connecting-point allows that any two
of the carbon-threads be connected with each other when the respective contact-ends
are connected with the electric current, and it likewise permits that 4 or 6 of the
carbon-threads are made to glow at the same time, if all their contact-ends are likewise
connected with the electric current.
By means of this arrangement it is possible not only to lengthen the burning period
of the lamps as long as may be desirable, by simply leading a greater number of
carbon threads from the common connecting-point to their separate contacts and by
burning two and more of them successively, but the lighting power of the lamp
can likewise be augmented by burning several of the carbon-threads at the same
time.
The carbon-threads can be connected at their common connecting-point by luting
them together, but the best method of producing a number of connected carbon-threads
is to take some interwoven fibrous material, such as silk leather etc., and to cut it out
in a particular shape described hereinafter and then to carbonize the threads and their
connecting-point altogether.
But there is still another novelty relating to the platina-wire soldered into glass-
shade of the lamp with the contact-screws. The space in the lamp has hitherto been
filled up with gypsum or some other non-conductor, but in the present invention it is
left empty and filled by air alone, by which means a far better and surer insulation is
obtained and more especially so as any moisture, that may happen to get in, may escape
through openings.
The way of making this glow-lamps is as follows:
A piece of silk, sheep-skin or other fibrous material is taken and the before-mentioned
particular shape is cut out, that is in other words, a thick centre-piece is cut out with

page_text: several long strips hanging to it. For the purpose of carbonizing the fibres of the
shape thus cut out, it is laid on a carbon cylinder in the shape of a sugar-loaf.
Recesses corresponding exactly with the piece of silk just cut out are previously made
in the carbon-cylinder and into them the shape is laid. The silk-shape fits into the
carbon cylinder so completely, that no projections are to been seen on the latter. A
hollow shade, that fits exactly on to the carbon-cylinder, is then taken and shoved
on to the latter, after which the carbonizing is carried out in the well-known
manner. The silk shape is then removed and prepared so as to have the proper
resistance.
The manner of preparing it is the same as that, for which the same inventor has
already obtained letters patent, and is as follows:
The carbonized silk-threads together with their connecting piece are coated over
with mineral salts and a gum and dipped in a parafine-bath and carbon is then
precipitated on them by means of the electric current. This preparation is not the
subject of the present patent, but it is only mentioned herein for the sake of greater
clearness and completeness. The fourfold or manifold carbon-thread is then inserted
in the lamp, fastened to the platina-wires and the lamp is closed. The platina-wires
are provided with eyes and to these the contact-wires, that lie free in a metal-pipe, are
fastened.
The air can therefore continually play round these contact-wires by means of which
the lamp is kept cool and a good insulation is obtained.
DESCRIPTION OF THE DRAWING.
For the sake of greater clearness the invention is represented in Fig. I to III of
the drawing. Fig. I shows a side-view of the carbon-thread, which is cut out of one
piece of material and the ends of which 1, 2, 3, 4, 5, 6 hang down from the centre
piece.
Fig. II shows a longitudinal section of the carbon-thread when inserted in the glow
lamp; the two foremost ends are cut off. This figure shows the poles a³ a¹ a³ a
smelted into the glass-body of the glow-lamp. Fig. III is a horizontal section
through the glass-body of the glow-lamp and also represents the poles a¹ a² a³ a¹ a³ a
smelted into it. Fig. II shows also that the brass cylinder or shell », bearing the glass
body, is hollow and that the air can play round the ends. By means of this the
poles are always kept cool and are well insulated. oo are the air holes ; x x are the
contact-screws.
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 :-
In glow-lamps:
1.) The employment of several carbon-threads, which are connected with one
another by means of a thickened centre-piece, and the ends of which are connected
with separated contacts, for the purpose as described.
2.) The employment of a hollow empty shell provided with air-holes in combination
with the platina-wires a a¹ a² a³
which pass free through this shell r for the
purpose as described.
Dated this 27th day of April 1887.