Process for the Production of Electrical Resistances with Small Heating Capacity.
Year: 1899

page_text: Date of Application, 20th Mar,, 1899-Accepted, 27th May, 1899
[Communicated from abroad by ALLGEMEINE ELEKTRICITATS-GESELLSCHAFT, of
Schiffbauerdamm, 22, Berlin, Germany.]
Process for the Production of Electrical Resistances with Small
Heating Capacity.
I, VICTOR ISIDORE TEENY, of 60, Queen Victoria Street, in the City and County
of London, Consulting Engineer and Chartered Patent Agent, 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 many industrial purposes it is desirable to have resistances which have but
small heating capacity, in order that the current flowing through them may bring
them as quickly as possible into the condition corresponding with or suited to
the intensity thereof. Thus, for example, it is desirable that heating bodies
should quickly attain their ultimate temperature after the current has been put
into circuit. The usefulness of electrical heating bodies frequently dependi
entirely on this point, as for instance, in lamps with illuminating bodies or fila-
ments composed of second class conductors (electrolytes) in which the heating
body serving for exciting the second class conductor (electrolyte) should reach
an incandescent state in a few seconds.
Likewise with resistances having considerable temperature coefficients, the
small heating capacity is an indispensable condition, if the ultimate condition,
as regards temperature and electrical ratio, is to be quickly reached, when the
current passes through, and if the resistance is to be immediately followed by
variations in the current.
The present invention consists in the fact that, for the purpose of effecting
the objects mentioned, the necessary insulating bearer or core for the conducting
material is reduced to a minimum. This may be effected in various ways.
The conductor may be tightly wound on very thin rods or hollow cylinders as
shewn in Figures 1 and 2 in the accompanying drawing or it may be stretched
across very thin flat frames as shewn in Figure 3, or around hollow bodies such
as shewn in Figure 4.
In a modification the wire closely wound and of any preferred cross-section
see Figure 5, may be embedded in its bearer as illustrated in Figure 6, the
wound wire or coil being covered by an extremely thin insulating layer of
enamel, varnish porcelain or other suitable material. This may be effected in
the simplest manner by spreading the thick fluid insulating substance on the
wound wire, or steeping the latter therein, and then subjecting the whole to a
process of drying or heating, if required. This process can also be employed
for insulating the several wire windings of the resistances, illustrated in Figures 1
to 4.
If the material forming the resistances be a metal which easily oxidises in
either a cold or a heated state, the several resistances are enclosed in a vessel

page_text: such as shewn in Figures 7 and 8, in which a vacuum has been created or which
is filled with ineffective or indifferent gases.
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. Process for the production of electrical resistances with small heating
capacity, the distinguishing feature of which is that the bulk of the. supporting
material or core for the resistance is reduced to the minimum by winding the
wire on rods, frames, small tubes, or hollow bodies having thin sides made of
insulating material or by embedding the wire in a very thin cylinder of such
material, substantially as described.
2. The enclosing of the electrical resistances produced under the process indic-
ated in Claim 1, in a vessel in which a vacuum has been created or which is
filled to a greater or less extent with ineffective gases, substantially as described.
• Dated this 20th tree of Manh 1000
For the Applicant,
GEDGE & FEENY,.
60, Queen Victoria Street, London, E.C.,
Chartered Patent Agents.
For the Applicant,
GEDGE & FEENY,.
60, Queen Victoria Street, London, E.C.,
Chartered Patent Agents.