IMPROVEMENTS IN BORING GUN BARREIS AND ORDNANCE AND IN APPARATUS USED THEREIN
Year: 1867

page_text: LETTERS PATENT to John Piddington, of Gracechurch Street, in the City
of London; for the Invention of "IMPROVEMENTS IN BORING GUN BARREIS
AND ORDNANCE AND IN APPARATUS USED THEREIN."-A communication
from abroad by Joseph Jaspard, of Liége, in the Kingdom of Belgium,
Mechanician.
PROVISIONAL SPECIFICATION left by the said John Piddington at the
Office of the Commissioners of Patents, with his Petition, on the 11th
May 1867.
I, JOHN PIDDINGTON, of Gracechurch Street, in the City of London, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN BORING
GUN BARRELS AND ORDNANCE AND IN APPARATUS USED THEREIN," being a com-
munication to me from abroad by Joseph Jaspard, of Liége, in the Kingdom
of Belgium, Mechanician, to be as follows:-
This Invention consists in certain improvements in and apparatus to be
used in connection with boring gun barrels and ordnance, whereby the incon-
veniences which arise from the heat produced by the friction of the boring
tools and by the accumulation in the boring of the metal which has been
removed are avoided.
A's is well known the present mode of cooling the drill or boring tool is.
by keeping the outside of the barrel or gun constantly wet, and by directing a
jet of liquid into the opening made in the barrel or gun; the jet however

page_text: after the drill or boring tool has advanced some distance always fails in
reaching the end of the opening; this imperfection is thus avoided by the
present Invention. The liquid employed is conveyed to the extremity of the
drill or boring tool and to the very point at which it is in contact with
the metal to be removed by means of a small tube of the same length as the
boring tube, and laid parallel therewith; this tube is connected at one end
thereof by a flexible joint of caoutchouc or other suitable substance with a
larger tube which conveys the liquid from a reservoir placed above the boring
engine; the heating of the drill or boring tool and barrel or gun is thus very
much reduced, and the exterior of-the-barrel-or gun does not require to be
kept cool by the application of any liquid. The boring bench is slightly
inclined-in the direction of the mouth of the barrel or gun so as to facilitate
the escape of the borings which are removed by means of the current of liquid
conveyed by the before-mentioned tube, and which liquid in returning carries
with it the borings, thus obviating the necessity for the removal of the barrel
or gun from the boring bench for the purpose of getting rid of the borings.
This Invention is equally applicable to the boring of the barrels of small arms
and of ordnance of any calibre."
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Piddington in the Great Seal Patent Office on the
9th November 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN-
PIDDINGTON, of Gracechurch Street, in the City of London, send greeting.
WHEREAS Her, most, Excellent Majesty Queen Victoria,. by Her Letters
Patent, bearing date the Eleventh day of May, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirtieth year of Her.
reign, did, for, Herself, Her, heirs and successors, give and grant unto me,
the said John Piddington, Her special licence that. I, the said John Pid-
dington, my executors, administrators, and assigns, or such others as I,
the said John, Piddington, my, executors, 'administrators, and assigns, should
at any time agree, with, and 'no others, from time to time and at all times
thereafter during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of. Great Britain. and.
Ireland; the, Channel Islands, and Isle of. Man, an Invention for "IMPROVE-
MENTS IN BORING GUN. BARRELS AND ORDNANCE, AND IN APPARATUS USED
THEREIN," being a communication to me from abroad by Joseph Jaspard, of

page_text: Liége, in the Kingdom of Belgium, Mechanician, upon the condition (amongst
others) that I, the said John Piddington, my executors or administrators,
by an instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and cause
the same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters Patent..
NOW KNOW YE, -that I, the said John Piddington, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement, reference being had to the annexed Drawings, and to the figures
and letters marked thereon, that is to say:-
My said Invention consists in certain improvements in and apparatus to
be used in connection. with boring gun barrels and ordinance whereby
the inconveniences which arise from the heat produced by the friction of the
boring tools and by the accumulation in the boring of the metal which has
been removed and the difficulty of getting rid of it out of the barrel are
avoided.
The present mode of cooling the drill or boring tool used for these purposes
is as is well known by keeping the outside of the barrel or gun constantly wet
and by directing a jet of liquid into the opening made in the barrel or gun.
The effect of using a jet of liquid as last mentioned is that when the drill or
boring tool has advanced into the barrel to a short distance the jet of water;
no matter with what force it may be thrown, does not reach the end of the
drill or boring tool, which consequently works dry during the greater portion
of the time and quickly becomes heated; moreover, the borings themselves
increase to such an extent as to frequently cause the drill or boring tool to
break, and the workman is compelled to stop the boring machine very
frequently to remove the barrel and empty out the borings, hence arise
great loss of time from stoppages, the rapid wear of the drill or boring tool,
and a deviation in the bore from the straight line which not unfrequently
spoils the barrel; these objections and difficulties are thus avoided by my
said Invention. The liquid employed (usually water and soap) is conveyed
to the extremity of the drill or boring tool, and to the very point at which it
is in contact with the metal to be removed, by means of a small tube of the
same length as the boring tool and laid parallel therewith; this tube is
connected at one end thereof by a flexible joint of caoutchouc or other suitable
substance or material with a larger tube which conveys the liquid from a
reservoir placed above the boring engine. The heating of the drill or boring

page_text: tool and of the barrel or gun is thus, very much reduced, and the exterior of
the barrel or gun does not require, to be kept cool by the application of any
liquid. The boring bench is slightly, inclined in the direction of the mouth
of the barrel or gun so as to facilitate the escape of the borings, which
are removed by means of the current of liquid which is conveyed by the
before-mentioned tube, and which liquid in returning carries with it the
borings, thus obviating the necessity for the removal of the barrel or gun
from the boring bench for the purpose of getting rid of the accumulated
borings.
My said Invention is equally applicable to the boring of the barrels of small
arms and of ordnance of any calibre.
My said Invention will be more clearly understood by reference to the
annexed Drawings, and to the figures and letters marked thereon.
Figure 1 is an elevation of a gun barrel shewing the drill or boring tool
and tube in dotted lines; Figure 2 is a sectional view of a barrel drill or
boring tool and tube, and Figure 3 is a transverse section of the same. In
these Figures C is the barrel; F, the drill or boring tool; T, the tube; H, the
interior of the barrel.
Having thus fully described and ascertained the nature of my said Invention
and the manner in which it is to be performed, I would observe in
conclusion that what I consider novel and original and therefore claim as
constituting the Invention secured to me by the said herein-before in part
recited Letters Patent is, the improvements in boring gun barrels and
ordnance and in apparatus used. therein, as herein-before described and set
forth, or any mere modifications thereof.
In witness whereof, I, the said John Piddington, have hereunto set my
.
hand and seal, this Ninth day of November, in the year of our Lord
One thousand eight hundred and sixty-seven.
JOHN PIDDINGTON.
L.S.)
Witness,
T. COLE,
Clerk to Mr. Vaughan,
Patent Agent,
54, Chancery Lane, W.C.