Improvements in Sporting Cartridges.
Year: 1888

page_text: Date of Application, 22nd Dec., 1888
Complete Specification Left, 20th Sept., 1889-Accepted, 26th Oct., 1889
PROVISIONAL SPECIFICATION.
Improvements in Sporting Cartridges.
I, ABRAHAM MARTIN, of 177 Aston Lane, Perry Barr, Birmingham, in the County
of Warwick, Engineer, do hereby declare the nature of this invention to be as
follows:-
My Invention relates to an improvement in sporting cartridges; and has for its
object to obtain, with an ordinary straight or cylindrical barrel, equal or greater
advantages, as regards carrying power, to those obtained by means of a choko bore
whilst reducing the recoil and the friction of the shot in the barrel.
My Invention consists in enclosing the charge of shot within a cylindrical sheath
or thimble placed within the cartridge case whereby the charge is held together whilst
passing through the barrel and is entirely prevented from coming in contact with the
sides of the bore. By means of this sheath the charge is projected from the barrel
in a compact mass which is quickly disengaged from the encircling sheath as the latter
soon drops behind, leaving the shot free to continue its direction and to spread to the
necessary extent. This inner sheath is made preferably of pasteboard and in its
preferred form it is closed at the rear end by a dise whilst its sides are slit longitudi-
nally from the front towards the rear, so that the open mouth of the sheath on
meeting the resistance of the atmosphere tends to spread radially whereby the progress
of the sheath is at once checked and the charge of shot is left free to proceed
onwards in a more or less compact mass.
The sheath may, but with less advantage, have its rear end closed only by the wad
behind it. This sheath is preferably greased externally to still further reduce the
friction in the barrel. In combination with this sheath, I divide the front wad into
two or more parts which readily yield and separate by the pressure of the shot behind
them so as not to obstruct the progress of the charge.
Dated this 92nd day of Dosambar 1888
By A. M. & Wm. Clark,
A. MARTIN.
53, Chancery Lane, London, Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Sporting Cartridges.
I, ABRAHAM MARTIN, of 177, Aston Lane, Perry Barr, Birmingham, in the County
of Warwick, Engineer, 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:-
.
My Invention relates to an improvement in sporting cartridges and has for its
object to obtain, with an ordinary straight or cylindrical barrel, equal or greater
advantages as regards projection to those obtained by means of a choke bore whilst
reducing the recoil and the friction of the shot in the barrel, inseparable from that
form of barrel.
My Invention consists in enclosing the charge of shot within a cylindrical sheath
placed within the cartridge case whereby the charge of shot is held together in a
compact mass whilst passing through the barrel, so that when projected from the
barrel the charge, which quickly becomes disengaged from the sheath, retains its
compactly-massed condition through a considerable portion of its flight.
Reference is to he had to the accompanying drawings forming part of this specifi-
cation, wherein figure 1 represents a central longitudinal section of the sheath of my
invention in position in a cartridge which is indicated in dotted lines. Figure 2 is

page_text: an end view of the sheath, and figure 3 a face view of the divided wad. Figure 4
shews the expansion of the sheath on emerging from the barrel, and figure 5 is a
back view of same. The same letters of reference indicate the same parts in all the
figures.
The sheath a may be made of pasteboard or of very thin metal and is closed at the
rear end by a disc b. It fits within the ordinary cartridge case c and envelopes the
charge of shot. Its sides are slit longitudinally at about eight points more or less
around the circumference, the slits d extending from the front end towards the rear
for a distance of about three-fourths the length of the sheath. The sheath is thus
divided into segments which, on the open mouth of the sheath encountering the resist-
ance of the atmosphere, spread radially as soon as the sheath emerges from the barrel
whereby the progress of the sheath is at once checked. The rear end of the sheath
may, however, but with less advantage, he closed only by the wad behind it. This
sheath is preferably greased externally to reduce the friction in the barrel which is
entirely protected from contact with the shot and from the consequent wear.
The front wad e used in combination with this sheath is divided into two semi-
circular parts which readily yield and separate by the pressure of the shot behind
them immediately on emerging from the barrel so as not to obstruct the progress or
cause any deviation in direction of the charge of shot.
By employing a pasteboard sheath of greater thickness, the effective calibre of the
barrel may be reduced at will by diminishing the diameter of the charge of shot.
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 1
claim is ;
1. The combination, with a sporting cartridge, of a sheath enclosing the charge of
shot, open at the front and enclosed at the rear end, and slit longitudinally from the
front towards the rear end so as to open automatically, substantially as and for the
purpose specified.
2. In a sporting cartridge, the combination, with a longitudinally-slit inner sheath
open at the front and closed at the rear end and enclosing the charge of shot, of a
divided front wad, substantially as and for the purpose specified.
Daten LOS ZULn day or Neptember 18
Dren LOS ZULA day of Nebreinber 18X
A. MARTIN.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.