pose method of and means for Connecting Threads of Carbon with Platinum Wire.
Year: 1885

page_text: pose method of and means for Connecting
Threads of Carbon with Platinum Wire.
I, CARL SEEL of Charlottenburg in the Empire of Germany Electrical Engineer,
do hereby declare the nature of this invention to be as follows:-
My invention relates to improvements in the method of and means for connecting
threads of carbon with platinum wire and is characterised by the employment of
platinum wire with enlarged recessed ends in which the carbon threads are put for
the purpose of being afterwards securely connected to the platinum wire, that is to
say, to its enlarged ends by the formation of a vacuum and subsequent introduction
of black lead paste.
The carbon thread itself consists of gut or other fibre formed into a triangular
shape and of uniform consistence by previously rolling the same in order that
during the operation of connection the same may not break easily.
The connection is formed in the following manner :-
The carbon bend, triangular in section and compressed by means of rollers, is
placed on a die or plate formed with two half-ball shaped recesses and faced with
india-rubber, in which recesses are placed the enlarged ends of the platinum wires.
The pointed end of the carbon thread is put into the recess formed in the
enlarged end of the platinum wire. After having placed all three parts in their
proper positions, another die or plate formed correspondingly is placed on the first
named one and both dies or plates securely fastened together by means of suitable
screws.
After securing the said dies or plates tightly together, whereby the platinum
wires and carbon bend are placed between two india-rubber surfaces, the air
contained in the recesses of the dies or plates is pumped out through a pipe and
channels formed therein and a vacuum created at the place of connection of
platinum & carbon.
The air pump is then stopped and by means of another pipe and other channels,
blacklead paste (for instance black lead and albumen mixed) run into the space
where the vacuum exists, which fills the same and forms a secure connection
between platinum and carbon thread after the paste has become cold.
After removing one die or plate the platinum wire connected with the carbon
bend can readily be taken out and the same melted into the glass globe in the well
known manner.

page_text: Threads of Carbon with Platinum Wire.
I, CARL SEEL of Charlottenburg, in the Empire of Germany Electrical 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:—
My invention relates to improvements in the method of and means for connecting
threads of carbon with platinum wire and is characterized by the employment of
platinum wire with enlarged recessed ends in which the carbon threads are put for
the purpose of being afterwards securely connected to the platinum wire, that is to
say, to its enlarged ends, by the formation of a vacuum and subsequent introduction
of black-lead paste.
And in order that this invention may be better understood I have caused to be
appended hereunto one sheet of drawings marked with letters of reference, indicating
like parts throughout the various figures.
Fig. 1, is a cross section and Fig. 2, a plan of the apparatus. Fig. 3, is a side
view and Fig. 4, a cross section of the carbon thread, and Fig. 5 a sectional view
of the connection between carbon threads and platinum wire.
In carrying out my invention and referring to the figures generally, the carbon
thread b, itself, consists of gut or other fibre formed into a triangular shape and of
uniform consistence, by previously rolling the same, in order that during the
operation of connection, the same may not break easily.
The connection is formed in the following manner :-
The carbon bend b, triangular in section & compressed by means of rollers, is
placed on a die or plate p formed with two half-ball shaped recesses i and faced
with india-rubber g. in which recesses i are placed the enlarged ends o of the
platinum wires d.
The pointed end of the carbon thread 6 is put into the recess e formed in the
enlarged end of the platinum wire d.
After having placed all three parts in their proper positions, another die or
plate p¹ formed correspondingly is placed on the first named die or plate p, and
both dies or plates, p and p¹, securely fastened together by means of suitable
screws or clamps k.
After securing the said dies or plates p and p¹ tightly together, whereby the
platinum wires d and carbon bend 6 are placed between two india rubber surfaces,
the air contained in the recesses i of the dies or plates p and p¹, is pumped out
through a piper, and channels t and t¹ formed therein, and a vacuum created at
the place of connection of platinum & carbon.
The air pump is then stopped, and by means of another pipe r³, and other
channels t' and t³, black lead paste, (for instance black lead and albumen mixed)
run-into the space where the vacuum exists which fills the same and forms a
secure connection between platinum wire d and carbon thread b after the paste has
become cold,

page_text: After removing one die or plate p, the platinum wire d connected with the
carbon bend b, can readily be taken out & the same melted into the glass globe in
the well-known manner.
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 incandescent lamps;-
First. The method of forming a connection between platinum wire d with
enlarged ends o, and the carbon thread b, by means of removing the air out of the
parts d and b, placed between two dies or plates p and p¹ and subsequent intro-
duction of black lead paste (or other conducting material which does not become
fluid through heat), filling up the spaces between platinum wire & carbon thread
as set forth.
Second. By the method specified in the preceding claim, the employment of
carbon thread of an angular section, compressed by means of rollers for the purpose
of preventing the breaking of the carbon thread, during the operation of connection,
as set forth.