mprovemo CE FRONTI Lamps.
Year: 1884

page_text: mprovemo CE FRONTI Lamps.
I, FRANK WYNNE of 4, Carteret Street Queen Anne's Gate, Westminster, in the
County of Middlesex do hereby declare the nature of my invention for IMPROVE-
MENTS IN INCANDESCENCE ELECTRIC LAMPS to be as follows:-
My Invention relates principally to improvements in the deposit of carbon on the
filaments and connections of Incandescence electric lamps.
In the preparation of filaments for incandescence lamps a difficulty is experienced
in obtaining, by any mechanical methods, a large number of filaments of the same
electrical resistance and this equal resistance is specially required in lamps working
in parallel from a convenient source of electricity, so that one should not take more
current than the other. It is therefore usual when preparing a large number of
lamps of a given electrical resistance to prepare the filaments of somewhat higher
resistances than it is intended the finished lamps should have, then, by a process
known technically as the "reducing" process, to reduce the resistance down to that,
which the filaments are required to have.
This "reducing" process consists in suitably incandescing a filament by means of
a current of electricity, which is passed through it, while the filament itself is
surrounded by a suitable gas or liquid. Hitherto it has been usual to employ a
suitable hydrocarbon gas or liquid for this purpose and the effect of this heating
the filament in the hydrocarbon is that a deposit of carbon is made on the filament
and its electrical resistance is thereby reduced.
I have found that the same effect can be arrived at and with advantage, by
using bi-sulphide of carbon, either in the liquid or gaseous form. I sometimes mix
with it sulphuretted hydrogen or other suitable gas or liquid, the result being that
a very hard deposit of carbon, which has almost a metallic lustre, is deposited on
the filament.
I also employ the above bi-sulphide of carbon either alone or mixed with
sulphuretted hydrogen for the process of thickening the ends of the filaments &
joining them on to the platina terminals. This, I do, by heating the ends of the
filament & the ends of the platina terminals, when immersed in the bi-sulphide of
carbon or mixture of bi-sulphide of carbon & sulphuretted hydrogen or other
Buitable gas or liquid; the ends of the filament being inserted in a little spiral,
into which the ends of the platina terminals are formed.
This local heating I sometimes effect by passing a current of electricity of
suitable strength, from any convenient form of apparatus, through the parts to be
heated and sometimes by focussing on these parts the rays from a lens or burning
glass or reflector, this lens or burning glass or reflector, either concentrating the
rays of the sun or other suitable source of heat, such as the electric light.
T
1
1008.

page_text: I FRANK WYNNE of 112 Belvedere Road Lambeth in the County of Surrey,
Civil Engineer, do hereby declare the nature of my invention for IMPROVEMENTS IN
.INCANDESCENCE ELECTRIC LAMPS and in what manner the same is to be performed,"
to be particularly described and ascertained in and by the following statement:-
す
My Invention relates principally to improvements in the deposit of carbon on
the filaments and connections of Incandescence Electric lamps.
In the preparation of filaments for incandescence lamps, difficulty is experienced
in obtaining, by any mechanical methods, a large number of such filaments of the
same electrical resistance & this equal resistance is specially required in lamps
working in parallel from a common source of electricity so that one should not
take more current than the other. It is therefore usual when preparing a large
number of lamps of given electrical resistance to prepare the filaments of somewhat
higher resistances than it is intended the finished lamps should have, then by a
process, known technically as the "reducing" process to reduce the resistance down
to that which the filaments are required to have.
This reducing process consists in suitably incandescing a filament by means of a
current of electricity, which is passed through it, while the filament itself is
surrounded by a suitable gas or liquid. Hitherto it has been usual to employ a
suitable hydro-carbon gas or liquid for this purpose, and the effect of thus heating
the filament in the hydro-carbon is that a deposit of carbon is made on the
filament and its electrical resistance is thereby reduced.
I have found that the same result can be arrived at and with advantage, by
using bi-sulphide of carbon, either in the liquid or gaseous form. I sometimes mix
with it sulphuretted hydrogen, and sometimes chlorine or other suitable gas or
liquid, the result being that a suitable deposit of carbon is made on the filament.
I also employ the above bi-sulphide of carbon either alone or mixed with
sulphuretted hydrogen. for the process of thickening the ends of the filaments and
joining them on to the platina terminals. This I do by heating the ends of the
filament and the ends of the platina terminals when immersed in the bisulphide of
carbon or mixture of bi-sulphide of carbon and sulphuretted hydrogen; the ends
of the filament being inserted in a little spiral or other convenient attachment into
which the ends of the platina terminals are formed.
This local heating I sometimes effect by passing a current of electricity of
Buitable strength, from any convenient form of apparatus through the parts to be
heated when surrounded by the above gas or any suitable hydro-carbon gas or
liquid such as benzine, fusel oil, olefiant gas &c., and sometimes by focussing on
these parts the rays from a lens or burning glass or reflector, this burning glass or
reflector concentrating the rays of the sun or other suitable source of heat, such as
the electric light on the parts to be heated while the same is surrounded by a
suitable gas or liquid capable of being decomposed by heat and thus depositing
carbon on the part thus heated.

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
1. The method of reducing the Electrical resistance of the illuminating part of
an Electric lamp by heating the same electrically when it is immersed in bi-sulphide
of carbon.
2. The method of reducing the Electrical resistance of the illuminating part of an
electric lamp by heating the same electrically when it is immersed in a mixture of
bi-sulphide of carbon and chlorine gas.
3. The method of reducing the Electrical resistance of the illuminating part of
an Electric lamp by heating the same electrically when it is immersed in a mixture
of bi-sulphide of carbon and sulphuretted hydrogen..
4. The method of depositing carbon on the joint between the illuminating part
of an electric lamp and the platina wire which conducts the current to the same
by heating the part at which the deposit of carbon is desired electrically when it is
immersed in bi-sulphide of carbon, either alone, or in admixture with chlorine gas.
or sulphuretted hydrogen, or with either of these.
5. The method of depositing carbon on the joint between the illuminating part of
an electric lamp and the platina wire which conducts the current to the same by
heating the same by concentrating by any convenient means the heat rays from the
sun or other convenient source of heat, on the parts at which the deposit of carbon
is desired, when the same is immersed in a suitable hydro-carbon or in bi-sulphide
of carbon, either alone or in admixture with chlorine or sulphuretted hydrogen
substantially.as described.