Improvements in Bullets for Rifled Small Arms and Machine Guns.
Year: 1896

page_text: Date of Application, 25th Mar., 1896
Complete Specification Left, 22nd Dec., 1896-Accepted, 30th Jan., 1897
PROVISIONAL SPECIFICATION.
Improvements in Bullets for Rifled Small Arms and
Machine Guns.
I, WILLIAM JACKMAN JEFFERY, of 60 Queen Victoria Street, in the City of
London, Gun and Rifle Maker, do hereby declare the nature of this invention to
be as follows:
This invention relates to compound bullets in which an outer casing of steel or
other bard metal is filled with a core of softer metal. Heretofore, so far as I am
aware, the outer casing of such bullets has been made either with a closed rear end,
the softer metal being inserted from the front end, or with a closed front end, the
softer metal being inserted from the rear end. The first named method has the
disadvantage that the rear end of the bullet is too solid to expand in order to fill
the rifling of the barrel, and the second method the disadvantage that the front.
end is liable under certain circumstances, to be torn off from the rear end, and to be
projected from the barrel along with the softer metal core leaving the rear end of
the casing behind in the barrel.
In order to obviate these disadvantages I make the outer casing with a
transverse partition in the middle, or at any other suitable point in its length, and
insert the soft metal core from both ends of the casing, closing in the front end of
the casing to retain the front portion of the soft metal core in place, and to give the
said front end a proper shape, but leaving the rear end open so that it is free to
expand into the rifling of the bore.
By this means the tearing asunder of the front end of the outer casing from the
rear end is avoided by the transference of the pressure of the soft metal on the
closed front end of the casing due to the explosion of the powder, to the aforesaid
partition, whereby the strain on the front part of the metal of the casing becomes
a compressive one instead of a tensile, and along with this advantage is also
secured that of the open rear end of the outer casing which enables the said rear
end of the casing to expand into the rifling, in the same way as the ordinary
compound bullet with the casing closed at the front end.
Doted this 25th day of March 1896
W. J. JEFFERY,
Per W. H. Beck,
115 Cannon Street, London, E.C., Agent.
COMPLETE SPECIFICATION.
Improvements in Bullets for Rifled Small Arms and
Machine Guns.
I, WILLIAM JACKMAN JEFFERY, of 60 Queen Victoria Street, in the City of
London, Gun and Rifle Maker, 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 compound bullets in which an outer casing of steel or-

page_text: other hard metal is filled with a core of softer metal. Heretofore, so far as I am
aware, the outer casing of such bullets has been made either with a closed rear
end, the softer metal being inserted from the front end, or with a closed front end,
the softer metal being inserted from the rear end. The first named method has
the disadvantage that the rear end of the bullet is too solid to expand in order to
fill the rifling of the barrel, and the second method the disadvantage that the front
end is liable, under certain circumstances, to be torn off from the rear end, and to
be projected from the barrel along with the softer inetal core leaving the rear end
of the casing behind in the barrel.
In order to obviate these disadvantages I construct the bullet as shown in the
accompanying sheet of drawings, in which Figure 1 is a longitudinal section of a
bullet with my invention applied thereto, Figure 2 a corresponding elevation,
Figure 3 a front end view and Figure 4 a rear end view of same.
I make the outer casing A with a transverse partition B in the middle, or at
any other suitable point in its length, and insert the soft metal core C from both
ends of the casing, closing in the front end of the casing to retain the front portion
of the soft metal core in place, and to give the said front end a proper shape, but
leaving the rear end open or only slightly closed in as shown so that it is free to
expand into the rifling of the bore.
By this means the tearing asunder of the front end of the outer casing from the
rear end is avoided by the transference of the pressure of the soft metal on the
closed front end of the casing, due to the explosion of the powder, to the aforesaid
partition, whereby the strain on the front part of the metal of the casing becomes
a compressive one instead of a tensile, and along with this advantage is also
secured that of the open rear end of the outer casing which enables the said rear
end of the casing to expand into the rifling in the same way as the ordinary
compound bullet with the casing closed at the front end.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
First. The improvement in bullets for rifled small arms and machine guns, which
consists in constructing the outer casing of the bullet with a transverse partition,
substantially as described.
Second. The improvement in bullets for rifled small arms and machine guns,
which consists in constructing the outer casing of the bullet with a transverse
partition, and in inserting the soft metal core from both ends of the bullet,
substantially as described.
201
2000
W. J. JEFFERY,
Per W. H. Beck,
115 Cannon Street, London, E.C., Agent.