IMPROVEMENTS IN THE MANUFACTURE OF CENTRAL-FIRE CARTRIDGES
Year: 1882

page_text: LETTERS PATENT to Charlos Stuart Bailey, of Waltham Abbey, in the County
of Essex, for an Invention of "IMPROVEMENTS IN THE MANUFACTURE OF
CENTRAL-FIRE CARTRIDGES."
PROVISIONAL SPECIFICATION left by the said Charles Stuart Bailey at the
Office of the Commissioners of Patents on the 1st February 1882.
CHARLES STUART BAILEY of Waltham Abbey in the County of Essex.
"IMPROVEMENTS IN THE MANUFACTURE OF CENTRAL FIRE CARTRIDGES."
With a view to provide against escape of gas from what are known as central
fire gas tight cartridges their cases are now usually composed of the following
several metal and paper parts, namely a paper tube, an iron tube lining a base
cup; a flanged cap chamber, a percussion cap, an anvil, and a paper packing.
The blow of the plunger of the gun is given directly on to the crown of the cap
to ignite the charge, and the sides of the cap must exactly fit the cap chamber to
prevent escape.
In practice it is found that there is an escape of gas between the cap and the
walls of the cap chamber, and with hammerless guns as recently introduced such
gas finds its way into the locks and breech mechanism and after repeated firing
the corrosive deposit from the gases is liable to be detrimental to the working of
the gun.
Now my Invention is designed to prevent escape of gases, and to produce
cartridges specially adapted for hammerless guns.
For this purpose I dispenso with the iron tube lining above mentioned and in
combination with a cup made shorter than the ordinary cup and which I will call
the inner cup I provide an outer and longer cup so constructed and arranged as to
enclose the crown of the percussion cap and also the whole of the inner cup, which
latter, backed up by the paper packing, supports the flange of the cap chamber
substantially as represented in the accompanying enlarged sectional sketch
wherein a is the paper tube, b the inner cup, c the flanged cap chamber, d the
percussion cap, e the anvil, the paper packing, and g the outer cup.
Although I have described my improved cartridge case as made without an iron
tube lining, such a lining, may in some cases be used.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles Stuart Bailey in the Great Seal Patent Office on the
1st August 1882.
CHARLES STUART BAILEY of Waltham Abbey in the County of Essex.
"IMPROVEMENTS IN THE MANUFACTURE OF CENTRAL FIRE CARTRIDGES."
With a view to provide against escape of gas from what are known as central
fire gas tight cartridges their cases are now usually composed of the following
several metal and paper parts, namely, a paper tube, an iron tubo lining, a base
cup, a flanged cap chamber (containing a percussion cap and an anvil) and a paper
packing.
The blow of the plunger of the gun is given directly on to the crown of the
cap to ignite the charge, and the sides of the cap must exactly fit the cap chamber
to prevent escape.
In practice it is found that there is an escape of gas between the cap and the
walls of the cap chamber, and with hammerless guns as recently introduced such
gas finds its way into the locks and breech mechanism and after repeated firing
the corrosivo deposit from the gases is liable to be detrimental to the working of
the gun.
Now my Invention is designed to prevent escape of gases, and to produce
cartridges specially adapted for hammerless guns.
For this purpose I dispense with the iron tube lining above mentioned and in
combination with a cup made shorter than the ordinary cup and which I will call
the inner cup I provide an outer and longer cup so constructed and arranged as to
enclose the crown of the percussion cap and also the whole of the inner cup which
latter backed up by the paper packing supports the flange of the cap chamber, and
withstands the explosion. Referring to the accompanying Sheet of Drawings
Fig. 1 is a vertical central section to an enlarged scalo of an improved central fire
cartridge according to my Invention. a is the paper tube around which is the
outer metallic cup y, enclosing the crown of the percussion cap and carried up
about five eighths of an inch to support the paper tube. This cup g I construct
of thin brass (005 inch is a suitable thickness) to offer as little resistance as
possible to the plunger of the gun. The base of the cup is indented to show the
position of the cap. bis the inner cup, which must be sufficiently strong to
withstand the blow of the plunger without concaving, or missfires will be likely
to result. I find that best charcoal sheet iron 015 inch thick is stout enough for
the purpose. Also it is very important that the rim of the cup b should fill the
head of the cup g. Now in order to produce an inner cup 6 of the requisite
strength and to ensure that its rim shall fill the head of the cup g, I prefer in
practice to adopt, in carrying out my present Invention, an Invention described in
the Provisional Specification of my application for Letters Patent No. 3625 dated
31 July A.D. 1882 according to which I strike the cup b in the corrugated form
shewn in Fig. 2, and, in making the cartridge the pressure in the closing process
flattens out the corrugation and aids the formation of the bead gl. c is the cap
chamber; it is maintained in position by its flange being included within the inner
and outer cups. d is the percussion cap and c the anvil.
Having thus described the nature of the said Invention and the manner in
which it is to be performed I would have it understood that what I consider to be
novel and original and therefore claim as socured to me by the Letters Patent
herein before first in part recited is :-
The improved manufacture of central fire cartridges wherein a thin outer cup to
prevent escape of gases into the gun lock is combined with a thick inner cup

page_text: (backed up by packing) to hold the cap chamber and withstand the blow of the
gun plunger and the force of the explosion all substantially as above described
and illustrated (but excluding the improvement in the cup b described with
reference to Fig. 2).
In witness whereof I the said Charles Stuart Bailey have hereunto set my
hand and seal this First day of August in the year of our Lord One
thousand eight hundred and eighty two.
CHARLES STUART BAILEY. (L.S.)