Improvements in or connected with Electrical Resistances.
Year: 1896

page_text: Date of Application, 21st Apr., 1898
Complete Specification Left, 20th Jan., 1897-Accepted, 17th Apr., 1887
Improvements in or connected with Electrical Resistances.
I, HENRY EDMUNDS, of 39 Victoria Street, in the City of Westminster,
Electrical Engineer, do hereby deolare the nature of my invention to be as
follows:-
It is the object of my invention to provide electrical resistances in which tho
heat generated is rapidly dissipated and this I effect by combining with the
resistance a conductor of heat, which is of such material other than that of
the resistance, or is of such greater sectional area that it acts as an efficienţ
radiator of the heat as to dissipate it from the resistance whilst it does not
constitute a conductor for electricity to interfere with the efficient action of the
resistance.
The conductor of heat may be combined with the resistance in various ways.
A convenient arrangement is to make the material of the resistance constituto the
warp of a wire mesh, the weft being constituted by wires of a better heat conductor,
or of the same material as the resistance but of greater cross sectional arca. The
weft wires are in separate pieces not so connected with each other as to electrically
short circuit tho resistance, or any considerable portion thereof. Or I may thread
discs of the heat conductive material upon the resistance at suitable distances
apart, or otherwise arrange the conductors of heat so that they act to effect tho
dissipation of heat from the resistance whilst not interfering otherwise with its
electrical functions.
Dated this 21st day of Amil 1904
JOHNSONS & WILLCOX,
47 Lincoln's lun Fields, Loudou, W.C., Agents.
Improvements in or connected with Electrical Resistances. .
I, HENRY EDMUNDS of 39 Victoria Street, in the City of Westminster,
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 :-
It is the object of my invention to provide electrical resistances in which the
heat generated is rapidly dissipated and this I effect by combining with the
resistance a conductor of heat which is of such material other than that of
the resistance, or is of such greater sectional area that it acts as an efficient
radiator of the heat to dissipate it from the resistance whilst.it does not constitute
a conductor for electricity to interfere with the efficient action of the resistance.
The conductor of heat may be combined with the resistance in various ways.
A convenient arrangement is as illustrated by Figure 1 of the accompanying
drawings to make the material a of the resistance constitute the warp of a wire

page_text: mesh, the weft being constituted by wires b of a better heat conductor, or of the
same material as the resistance but of greater cross sectional area. The weft
wires are in separate pieces not so connected with each other as to electrically
short circuit the resistance, or any considerable portion thereof.
I have shewn the wires 6 throughout, only a portion of the extent of the wires a
but they may extend throughout the whole of the extent of the wires a or any
desired portion thereof. Or I may thread discs of the heat conductive material
upon the resistance at suitable distances apart, or otherwise arrange the conductors
of heat so that they act to effect tho dissipation of heat from the resistance whilst
not interfering otherwise with its electrical functions.
In Figure 2 I have shewn applied to the resistance wires a' at one part discs 6*
each threaded upon each wire and at another part discs & each threaded upon two
of the wires, distance pieces c of insulating material being placed between them to
keep them in place. The discs may each embrace one, two, or more wires as
desired and extend throughout the length of the wires a or any desired portion
thereof.
I do not limit myself to the use of particular materials but I instance reostene or
manganio as suitable for the resistance wires and copper as suitable for the heat
dissipators.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the samo is to be performed, I declare that what I
claim is :
1. The combination with electrical resistances of a conductor or radiator of heat
of such other material than the resistance or of such greater sectional area than
that of the resistance, that it acts as a heat dissipator whilst it does not interfere
with the electrical efficiency of the resistance, substantially as hereinbefore
described.
2. The combination with electrical resistance wires of wires interwoven therewith
and disconnected from each other and of a material of such different character from
that of the resistance or of such larger sectional area as to act as a heat dissipator
without interforing with the electrical efficiency of the resistance, substantially as
hereinbefore described and illustrated by Figure 1 of the accompanying drawings.
3. An electrical resistance having threaded thercon discs of material which will
dissipate heat without interfering with the electrical efficiency of the resistance,
substantially as hereiubefore described and illustrated by Figure 2 of the
accompanying drawings.
Dated this 20th day of January 1897.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.