Year: 1888

page_text: Date of Application, 18th May, 1888
Complete Specification Left, 18th Feb., 1889
Complete Specification Accepted, 27th Apr., 1889
A communication from GEORGES MANET, Electrician, and CHARLES MANET,
engineer, of 61 rue Lecourbe, Paris, in the Republic of France.
I ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
M.I.M.E. do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in electrical fuses and consists essentially
in placing a platinum wire inside the fuse, which platinum wire is connected with thic
line wires leading to the source of electricity. This platinum wire may be straight or
in form of a spiral spring or in V form and may be arranged in the axis of the fuse
or parallel to the axis or in an inclined position.
The fuse consists of cardboard or other suitable tube in which is placed a support of
wood or other insulating material to which are fixed or attached two screws, studs,
clamps or the like which electrically connect the line wires with the ends of the
platinum wire. The tube is then filled with the detonating powder which surrounds the
platinum wire and is ignited by the beat of this wire when the electric current passes
therethrough. The tube is closed at one end with a paper wooden, cork, or other
suitable plug, inflamable or not in form of a quick match and the other end is closed
with insulating cement which prevents any escape of gas to that side.
If this fuse is used for firing dynamite a fulminating cap of suitable strength
is added.
The fuse thus prepared is pushed down the blast hole right into the explosive used
and is fired by passing an electric current through the platinum wire.
The platinum wire may be placed in any suitable position and the fuse may be made
of any desirable size. The platinum wire may also be replaced by a copper wire of
high resistance or by any other suitable wire giving the same result.
Dated this 18th day of May 1888.

page_text: Improvements in or relating to Electrical Fuses for Firing the
Charge of Blast Holes and the like.
A communication from GEORGES MANET, electrician, and CHARLES MANET,
engineer, of 61 rue Lecourbe, Paris, in the Republic of France.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.L.M.E., 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 :-
This invention relates to improvements in electrical fuses and consists essentially in
placing a platinum wire inside the fuso which platinum wire is connected with the
line wires leading to the source of electricity. This platinum wire may be straight or
in the form of a spiral spring or in V form and may be arranged in the axis of the
cartridge or parallel to the axis or in an inclined position.
In the accompanying drawings, Figs. 1 to 4 represent sections of different forms in
which the fuse may be constructed.
The fuse case consists of a cardboard or other suitable tube d in which is placed a
support a of wood or other insulating material to which are fixed or attached two
screws, studs, clamps or the like which electrically connect the line wires h with the
ends of the platinum wire c. The tube is then filled with the detonating powder f
which surrounds the platinum wire c and is ignited by the heat of this wire when the
electric current passes through it. The tube is closed at one end with a paper, wooden,
cork or other suitable plagg inflammable or not, in form of a quick match and the
other end is closed with insulating cement which prevents any escape of gas to that
side.
If this fuse is used for firing dynamite a fulminating cap j of suitable strength
is added.
The fuse thus prepared is pushed down the blast hole right into the explosive used
and is fired by passing an electric current through the platinum wire.
The platinum wire may be placed in any suitable position and the fuse may be made
of any desirable size. The platinum wire may also be replaced by a copper wire
of high resistance or by any other suitable wire giving the same result.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondents, I declare that what I claim is :-
The construction of a fuse or detonator containing a platinum or other suitable
wire in electrical connection with the line wires substantially as specified.
Dated this 18th day of February 1889.
W. P. THOMPSON & BOULT,
Agents.