Improvements in Electrical Out-outs.
Year: 1896

page_text: Complete Specification Left, 20th Jan., 1897-Accepted, 6th Mar., 1897
PROVISIONAL SPECIFICATION.
Improvements in Electrical Out-outs.
HENRY EDMUNDS of 39 Victoria Street in the City of Westminster
Electrical Engineer do hereby declare the nature of this invention to be as
follows:-
In electrical cut-outs as hitherto arranged, so as to interrupt the electric circuit
by fusion, it has been found advisable to euclose them in some description of
protective box, or enclosure; but this has hitherto been found objectionable owing,
I believe, to the metallic vapours generated by the fusion of the material of the
out-out, acting as a conductor of the current through the part in which the cut-out
was enclosed, and possibly causing fire. According to my invention I surround
the cut-out wire, or strip, with a material which is insulating, or non-conductive of
electricity, and non-inflammable, and which at the same time is sufficiently porous
or sufficiently permeable, to allow of the escape of any metallic vapour which may
form on the fusion of the material of the cut-out. I have found that fibres of
asbestos plaited, or interwoven, so as to form a covering for the cut-out wire, or
strip, answer the purpose well preventing the formation of an arc or flame on the
fusion of the cut-out; but I do not limit myself to the use of asbestos fibres, as
other material of a like nature as regards non-conductive, non-combustible, and
porous, or permcable, qualities can be employed in place thereof or in addition
thereto.
Dated this 21st day of April 1808
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
Improvements in Electrical Cut-outs.
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 :-
In electrical cut-outs as hitherto arranged, so as to interrupt the electric circuit
by fusion, it has been found advisable to enclose them in some description of
protective box, or enclosure; but this has hitherto been found objectionable owing,
1 believe, to the metallic vapours generated by the fusion of the material of the
cut-out, acting as a conductor of the current through the part in which the cut-out
was enclosed, and possibly causing fire. According to my invention I surround
the cut-out wire, or strip, with a material which is insulating, or non-conductive of
electricity, and non-imflammable and which at the same time is sufficiently porous
or sufficiently permeable to allow of the escape of any metallic vapour which may

page_text: form on the fusion of the material of the cut-out. I have found that fibres of
asbestos plaited or interwoven, so as to form a covering for the cut-out wire, or
strip, answer the purpose well, preventing the formation of an arc or flame on the
fusion of the cut-out, but I do not limit myself to the use of asbestos fibres, as
other material of a like nature, as regards non-conductive, non-combustible, and
porous, or permeable, qualities, can be employed in place thereof or in addition
thereto.
The accompanying drawing shews a fusible cut-out a surrounded by a covering b
of material of the nature aforesaid; although I have shewn a reduced portion of a
conductor as the cut-out it will be understood that the fusible cut-out may be of
other description.
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 :-
The combination with electrical cut-outs of a covering of insulating or non-
conductive character and non-inflammable and also sufficiently permeable or
porous to allow of the escape of metallic vapours substantially as hereinbefore
-explained.
Dated this 20th day of Jenue 100%
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.