An Improvement in Conductors for Electrical Glow Lamps.
Year: 1891

page_text: Date of Application, 23rd Feb., 1891
Complete Specification Left, 29th Oct., 1891-Accepted, 5th Dec., 1891
PROVISIONAL SPECIFICATION.
An Improvement in Conductors for Electrical Glow Lamps.
I, EDWARD ALFRED GIMINGHAM, of The Edison and Swan United Electric
Light Company Limited, Ponders End, in the County of Middlesex, Electrician,
do hereby declare the nature of this invention to be as follows:-
This invention relates to the conductors of electrical glow lamps which have to
be sealed through the glass of the globe or bulb, its object being to reduce expense
by economising platinum and to facilitate the hermetical scaling.
For this purpose a short piece of platinum wire is brazed or welded, electrically
or otherwise, to a wire of cheaper metal such as iron, copper or nickel. Over this
latter wire and over its junction with the platinum is passed a glass tube somewhat
loosely fitting the wire, and the end of this tube where it encloses the platinum is
hermetically sealed around the platinum.
The glass sheathed wire is then passed through a hole of the bulb or globe, the
glass of which is hermetically sealed to the glass of the sheath.
Dated this 23rd day of February 1891
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Conductors for Electrical Glow Lamps.
I, EDWARD ALFRED GIMINGHAM, of The Edison and Swan United Electric
Light Company Limited, Ponders End, in the County of Middlesex, Electrician,
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 :-
For
This invention relates to the conductors for connecting to the illuminants of
electrical glow lamps which have to be sealed through the glass of the globe or
bulb, its object being to reduce expense by economizing platinum and to facilitate the
hermetical sealing where the conductors pass through the glass of the bulb.
this purpose, a short piece of platinum wire is brazed or welded electrically or
otherwise to a wire of cheaper metal such as iron, copper or nickel. Over this
latter wire and over its junction with the platinum is passed a glass tube somewhat
loosely fitting the wire, and the end of this tube where it encloses the platinum
is hermetically sealed around the platinum. The glass sheathed wire is then passed
through a hole of the bulb or globe, the glass of which is hermetically sealed to
the glass of the sheathing tube.
Fig. 1 of the accompanying drawings is a vertical section of an electrical glow
lamp with the conductors arranged according to my invention, the wires being
hooked for connecting to contact hooks in the socket or holder of the lamp.
Fig. 2 is a part section of a lamp made on a larger scale, shewing the wires
brazed to a flexible conducting cord.
Fig. 3 is a longitudinal section of a conductor and its glass sheath shewing
hermetical sealing in an intermediate position.
Fig. 4 is a similar section shewing an intermediate sealing on divided platinum
wires.
As shewn in Fig. 1 the carbon c is joined as usual to platinum wire p but this is
a very short piece, brazed or welded to a wire n of comparatively inexpensive metal
such as iron, copper nickel or the like. This wire with part of the platinum wire p
í Price 6d 1

page_text: beyond its junction with n, is enclosed within a glass tube g the one end of which is
sealed around the platinum p, and the other end is sealed into the glass of the
bulb . It will be seen that by thus making the sealed joint on the platinum near
its junction to the carbon, the length of platinum wire is greatly reduced, as it has
not to extend as usual, to the glass of the bulb in order to be sealed there. After
sealing the glass tubes y to the bulb the hooked wires may be held firmly in position
by enclosing them in a bedding of glass clamped around them. As shown in Fig. 2
the glass tube may be trumpet mouthed projecting a little beyond the glass of the
bulb into which they are sealed and the wires n may be brazed to flexible con-
ducting cords w.
!
The illuminant may be connected directly to the wire of cheap material, a short
piece of platinum wire being used for the hermetical sealing as shewn by Fig. 3 in
which indicates the cheap wire in two lengths connected by a short piece of
platinum wire P with the glass tube g sealed round it. Instead of a single inter-
mediate scaling as at p Fig. 3 there might, if desired be two or more.
When the conductor is of considerable area, rendering the sealing of the glass
tube around the platinum somewhat difficult, the platinum p may be, as shewn in
Fig. 4, in the form of a bundle of small wires brazed to the wires, the glass tube
being sealed around these.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. A conductor for connecting to the illuminant of an electrical glow lamp, con-
sisting of a short length of platinum wire brazed or welded to wire of cheaper
metal, the whole enclosed within a glass tube one end of which is sealed around the
platinum, and the other end is sealed to the glass of the bulb, substantially as
described.
2. In a conductor such as is above referred to, introducing between separate
lengths of the cheaper metal, a short length of platinum wire or bundle of wires
and sealing the glass around the platinum, substantially as and for the purpose set
forth.
Dated this 29th day of October 1891
ABEL & IMRAY,
Agents for the Applicant.