Improved Electric High Tension Fuse Head for use in Blasting.
Year: 1893

page_text: Date of Application, 24th Aug., 1893-Accepted, 30th Sept., 1893
COMPLETE SPECIFICATION.
Improved Electric High Tension Fuse Head for use in Blasting.
We TOM MALSON of Harry Hill in the Township of East Dean in the County
of Gloucester and SIDNEY RICHARD MALSON of the same place Fuze Makers,
WILLIAM ALBERT MALSON of Drybrook in the same Township and County
Engine Driver and EMMANUEL SMITH of Drybrook aforesaid Shopkeeper 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 :-
Our invention relates to an improved high tension fuse head produced by fewer
processes and with greater safety in manufacturing than is usual in the making of
fuses.
Our invention is carried out in the following manner
6
A cylindrical wood block (Figure 1) three fourths of an inch long is turned down
to three sixteenths of an inch in diameter for the distance of seven sixteenths of an
inch two narrow vertical grooves a" "a" being cut in each side for the reception
of the leading wires. A groove "," one eighth of an inch long and one eighth of
an inch in diameter is then cut horizontally round the block leaving a shoulder "c"
three sixteenths of an inch long and one fourth of an inch in diameter. Through
this shoulder two holes "d" "d" are drilled vertically see Figure 2 or the shoulder
grooved down into a parallel line to meet the holes "d" "d" at the seat of the
shoulder see Figure 24 for leading wires to pass through and the block is coated
with shellac. These leading wires "e" "f" are then passed through the holes in
the shoulder or along the grooves of the shoulder and continued up both sides of
the block embedded in the vertical grooves to the end of the block passed over the
end one sixty fourth of an inch apart and brought down the opposite grooves to
the shoulder (see Figure 3).
A paper tube (Figure 4) is then passed over the small end of the block down to
the shoulder and made fast with common shellac. This tube projects one fourth of
an inch beyond the upper end of the block so as to form a receptacle for the
explosive composition (see Figure 5).
The composition is embedded between the wires at the end of the block in the
receptacle formed by the projection of the paper tube and sealed down.
"
The fuse head is then inserted into a detonator "g one and a half inch in length
(Figure 6) and the detonator clipped tightly round the small part of the block
formed by the horizontal groove before described, the exposed portion of the block
and the lower part of the detonator are then coated over with Chattertons
compound which is the best electric insulating composition for the purpose of which
we are at present aware, (Figure 7) and the fuse is ready for use.
The fusehead manufactured by this process cannot be inserted into the detonator
beyond the shoulder and thus prevents the fusehead from coming into contact with
the fulminate of mercury with which the detonator is charged and the detonator
being clipped round the groove in the block renders it impossible for the fusehend
to be withdrawn.
The fusehead being composed of wood is less liable to get warm in hot coal mines
and allow the wires to be withdrawn from the composition.
By a variation in the process of manufacturing these fuse heads we effect a
saving in labor and material by dispensing with the shoulder to the wooden block.
In this process the block is turned its whole length to three sixteenths of an inch
diameter. The vertical grooves for the reception of the wires are cut on each side
as before described and the horizontal groove cut round (see Figure 8). When
the wires are adjusted the block is enveloped by the paper tube down to the

page_text: horizontal groove and the fuse head is then finished off by precisely the same
process as is described in the former part of this Specification.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner it is to be performed we declare that what we claim is
1. The construction and method of construction of improved electric high tension
fuse heads as herein set forth.
2. The wooden blocks both with and without the shoulder (Figures 1, 2, 3
and 8) as herein set forth.
Dated this 15th day of August 1893.
TOM MALSON.
SIDNEY RICHARD MALSON.
WILLIAM ALBERT MALSON.
EMMANUEL SMITH.