Year: 1886

page_text: Date of Application, 12th June, 1886.
Complete Left, 12th Mar., 1887.
Complete Accepted, 15th Apr., 1887.
I, JOHN RIGBY, of Suffolk Street, in the City of Dublin, Gun manufacturer, do
hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in ammunition for small arms and guns of
various calibres, and has for its objects the prevention of the "fouling" of the interior
of the barrel of the firearm or gun when the same is fired, and also the increase of
the velocity of the projectile, and the accuracy of the firing.
In manufacturing cartridges, for example, in accordance with my present invention,
I place in the bottom of each, and below the charge of gunpowder, a compressed
annular cake, wad, or washer of an explosive of the nitro-compound class, such as gun
cotton or Schultze powder, for example. The amount of nitro-compound explosive
employed is very small in proportion to the charge of gunpowder, and is ignited by
the latter, and not directly by the cap or primer. On being ignited by the explosion
of the gunpowder, it accelerates materially the velocity of the projectile, and also clears
the barrel from those products of combustion or explosion which would otherwise be
deposited on the interior surface thereof and interfere with the accuracy of the
succeeding shot.
JOHN RIGBY.
Per W. H. Beck,
115, Cannon Street, London, E.C.,
Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in Ammunition.
I, JOHN RIGBY, of Suffolk Street, in the City of Dublin, Gun Manufacturer 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 ammunition for small arms and guns of
various calibres, and has for its objects the prevention of the "fouling" of the interior
of the barrel of the fire-arm or gun when the same is fired, and also the increase of
the velocity of the projectile and the accuracy of the firing.
In manufacturing cartridges, for example, in accordance with my present invention,
I place in the bottom of each and below the charge of gunpowder, a small secondary
charge composed of a compressed annular cake, wad, or washer of an explosive of the
nitro-compound class, such as gun cotton, or Schultze powder, for example. The
explosion of this secondary charge is slightly delayed either by compressing it as a
whole or so preparing or coating it that its ignition is retarded. The amount of nitro-
compound explosive employed is very small in proportion to the charge of gun-
powder and is ignited by the latter and not directly by the cap or primer. On being
ignited by the explosion of the said gunpowder, it accelerates materially the velocity
of the projectile, and also clears the barrel from those products of combustion or
explosion which would otherwise be deposited on the interior surface thereof and
interfere with the accuracy of the succeeding shot.
==
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 :-
In ammunition for small arms and guns of various calibres, the employment of a
secondary charge substantially as hereinbefore described and for the purposes
specified.
1به1
P 3.5
1 1007
J. RIGBY.
Per W. H. Beck,
115, Cannon Street, London,
Agent.