Improvements in and relating to Electric High and Low Tension. Fuse Heads for Use in Blasting and other Purposes.
Year: 1895

page_text: Date of Application, 8th June. 1895-Accepted, 13th July, 1895
COMPLETE SPECIFICATION.
Improvements in and relating to Electric High and Low Tension.
Fuse Heads for Use in Blasting and other Purposes.
1, GEORGE PETTINGER, Coal Factor and Explosives Merchant, of 98 Cor-
poration Street, Manchester, in the County of Lancashire, 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 :-
The present invention embraces improvements in the construction of those fuse
heads which are inserted in detonators employed for firing gunpowder, dynamite,.
roburite, and all other explosives used in blasting operations, submarine mining,
and like purposes, and an improved explosive compound for use in connection with
such fuse heads.
My improved fuse head is constructed of a tube of wood, porcelain, or other
material having a tapered bore. In this tube I secure the two wires used for con-
ducting the firing charge of electricity by first threading said wires therethrough
then bending these at a suitable distance from the ends thereof, so that the portion
between the bends and ends of the wire lies parallel to the remainder thereof, or
nearly so, and finally, after baring said wires at or near the bend and, when:
desired, connecting the bare portious thereof by a fine platinum wire, drawing said
wires, into the tube in such a manner that the bent portion thereof eventually
jambs in the tube.
The size of the bore of the tube is such that the bent portion of the wires jamb
at or near the middle thereof so leaving a suitable space for the introduction of the
necessary explosive compound, which is composed preferably of the following
ingredients. in about the proportions given.
5
COMPLETE SPECIFICATION.
Improvements in and relating to Electric High and Low Tension.
Fuse Heads for Use in Blasting and other Purposes.
1, GEORGE PETTINGER, Coal Factor and Explosives Merchant, of 98 Cor-
poration Street, Manchester, in the County of Lancashire, 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 :-
The present invention embraces improvements in the construction of those fuse
heads which are inserted in detonators employed for firing gunpowder, dynamite,.
roburite, and all other explosives used in blasting operations, submarine mining,
and like purposes, and an improved explosive compound for use in connection with
such fuse heads.
My improved fuse head is constructed of a tube of wood, porcelain, or other
material having a tapered bore. In this tube I secure the two wires used for con-
ducting the firing charge of electricity by first threading said wires therethrough
then bending these at a suitable distance from the ends thereof, so that the portion
between the bends and ends of the wire lies parallel to the remainder thereof, or
nearly so, and finally, after baring said wires at or near the bend and, when:
desired, connecting the bare portions thereof by a fine platinum wire, drawing said
wires, into the tube in such a manner that the bent portion thereof eventually
jambs in the tube.
The size of the bore of the tube is such that the bent portion of the wires jamb
at or near the middle thereof so leaving a suitable space for the introduction of the
necessary explosive compound, which is composed preferably of the following
ingredients, in about the proportions given.
Chlorate of potash
Black or red sulphide of antimony
Subphosphide or subsulphide of copper
Silver precipitated
Plumbago
Powdered charcoal
Bismuth
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وو
24 parts by weight.
12
"
"
"
6
"1
"
12
"
"
"7
1
"
"
"
"
"
"
"
"
"
0
The fuse head so constructed is then secured in the fulminate of mercury tube
in the usual manner, when the whole is ready for use.
In the accompanying drawing is shown a section of a fuse head constructed
according to my invention on an enlarged scale.
The tube a, which is of wood, porcelain, or other suitable material, has a tapered
5 bore and in this the wires b, used for carrying the firing charge of electricity, are
secured by bending the ends as shown, so that when the wires are pulled into their
proper position, the bent portion will be caused to jamb in the interior of
the tube.
The wires at the point where bent, are stripped of insulation, and when desired,
O connected by a very fine platinum wire, so that the necessary spark or heat may
pass through the explosive compound c placed in the tube prior to securing the
latter in an ordinary fulminate tube in the usual manner.
Where found preferable, the interior of the tube may be tapered through only a
part of its length, and the wires may be otherwise bent to cause them to jamb in the
tapered portion thereof.

page_text: 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) A fuse head constructed of a tube a having the interior thereof tapered
through the whole or part of its length and wires o connected thereto by bending
their ends so that the bent portions may be caused to jamb in the tapered portion
of the interior of said tube a substantially as described and illustrated in the
accompanying drawing.
(2) An explosive compound for use in connection with fuse heads formed of
chlorate of potash, black or red sulphide of antimony, subphosphide or subsulphide
of copper, silver precipitated, plumbago, powdered charcoal and bismuth,
substantially in the proportions described.
Dated this 29th day of Mar 1895
$6
CASTLE SMITH,
Invention" Office, 54 Fleet Street, London, E.C.,
Agent for the Applicant.