IMPROVE- MENTS IN THE BARRELS OF FIRE ARMS
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by the said Paul Ambroise Bayle at the
Office of the Commissioners of Patents on the 6th September 1883.
PAUL AMBROISE BAYLE of 29 rue de Chateaudun, Paris, Engineer "IMPROVE-
MENTS IN THE BARRELS OF FIRE ARMS
"
This Invention has for its object improvements in the barrels of fire arms.
For this purpose I form a contraction at some point in the length of the barrel
of a fire arm-I make the contraction of two coned surfaces joined end to end at
their truncated summits. The angle of these cones may vary, but the maximum
effect is obtained by giving to the front one an angle of 5° to 6° and to the rear
one an angle of 18° to 25°. The base of the latter coned surface reposes on a
cylinder, the length of which may vary but which is always of the same diameter
as the base of the cone. The diameter of the two cones at their point of junction
is equal to about one half the diameter of the base of the rear cone.
The length
of the upper cone varies, and that of the lower is determined by the angle of the
cone.
The contraction may be formed at either end, in the middle or at any other
point of the barrel and has the advantage of diminishing the recoil, of greatly
increasing the initial velocity of the projectile and of giving greater precision to
the firing.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Paul Ainbroise Bayle in the Patent Office on the 5th March 1884.
PAUL AMBROISE BAYLE of 29 Rue de Chateaudun, Paris, Engineer " IMPROVE-
MENTS IN THE BARRELS OF FIRE ARMS
"
This Invention has for its object improvements in the barrels of every kind of
fire arm.
For this purpose I form a contraction at some point in the length of the barrel
of a fire arm-I make the contraction of two coned surfaces joined end to end at
their truncated summits Figure 1
The angle of these cones may vary but the maximum effect is obtained by
giving to the front one A, Figure 1, an angle of 5° and to the rear one B an angle
of 18° to 25°-The base g. h of the latter coned surface reposes on a cylinder C the
length of which may vary but which is always of the same diameter as the base of
the cone B
The diameter of the two cones at their point of junction e. f is equal to about
one half the diameter of the base g. h of the rear cone B
The length of the upper cone A may vary but in general amounts to nine times
the diameter of the small base e. f and that of the lower cone is determined by the
angle of the cone
The upper cone A may be continued by a cylinder
The contraction may be formed at either end in the middle or at any point of
the barrel-It has the advantage of diminishing the recoil, of greatly increasing
the initial velocity of the projectile and of giving greater precision to the firing
What I claim as my invention is: The application to the barrels of every kind
of fire arms, of the contraction formed by two truncated cones joined at their
truncated summits and made in accordance with the above description.
In witness whereof I the said Paul Ambroise Bayle have hereunto set my
hand and seal this Twenty Eighth day of february one thousand eight hundred
and eighty four.