Year: 1886

page_text: Date of Application, 5th Nov., 1886.
Complete Left, 13th Apr., 1887.
Complete Accepted, 13th May, 1887.
I, GEORGE SMITH, of Polmont, in the County of Stirling, North Britain, Analytical
Chemist, do hereby declare the nature of this Invention to be as follows, that is to
say:
My said Invention has for its object to improve and simplify the formation of.
electrical fuses such as are used for blasting operations and for other purposes.
In carrying out my Invention I use a well known arrangement in which a pair of
insulated conducting wires are twisted together and have their ends from which the
insulating coating is removed placed near enough to each other for the passage of the
electric spark. In completing a fuse of this kind in the ordinary way, a small paper
tube is placed on the ends of the wires so as to enclose their points, and then what is
known as Abel's fuse composition, which is a powder, is filled into the paper tube so
as to be in contact with the uncovered points. This operation is troublesome and
requires considerable care in order to insure efficiency.
By my Invention the paper tube is dispensed with and the fuse composition is made'
into an adhesive paste or gum-like substance by being combined with a medium
which will not interfere with its ignition when a spark passes between the ends of the
conducting wires. I find collodion to be a very suitable medium with which to form
the paste, but others may also be used such as a solution of rubber or of shellac, or
other suitable resin. The paste-like composition is simply applied as a coating to
cover the uninsulated points of the conducting wires, and when dried thereon, the fuse
is complete and ready for use.
Dated this Fourth day of November 1886.
EDMUND HUNT,
Applicant's Agent.

page_text: VUMI LEIDDI MUIFICATION.
Improvements in Electrical Fuses.
I, GEORGE SMITH, of Polmont, in the County of Stirling, North Britain, Analytical
Chemist, 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, that is to say :-
My said Invention has for its object to improve and simplify the formation of
electrical fuses such as are used for blasting operations and for other purposes.
In carrying out my Invention I use a well known arrangement in which a pair of
insulated conducting wires are twisted together and have their ends from which the
insulating coating is removed placed near enough to each other for the passage of the
electric spark. In completing a fuse of this kind in the ordinary way, a small paper
tube is placed on the ends of the wires so as to enclose their points, and then what is
known as Abel's fuse composition, which is a powder, is filled into the paper tube so
as to be in contact with the uncovered points. This operation is troublesome and
requires considerable care in order to insure efficiency.
By my Invention the paper tube is dispensed with and the fuse composition is made
into an adhesive paste or gum-like substance by being combined with a medium
which will not interfere with its ignition when a spark passes between the ends of the
conducting wires. I find collodion to be a very suitable medium with which to form
the paste, but others may also be used such as a solution of rubber or of shellac, or
other suitable resin. The paste-like composition is simply applied as a coating to
cover the uninsulated points of the conducting wires, and when dried thereon, the fuse
is complete and ready for use. I prefer, however, as a precaution against the com-
positions becoming detached to apply a covering of sheep gut and to varnish the same
with shellac varnish as is commonly done with fuses of this kind when made in the
ordinary way.
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 :-
The application of the fuse composition in making electrical fuses in the form of
an adhesive paste and without the ordinary paper tube substantially as hereinbefore
described.
Dated this Twelfth day of April 1887.
EDMUND HUNT,
Applicant's Agent.