Year: 1888

page_text: Date of Application, 23rd Jan., 1888
Complete Specification Left, 17th Oct., 1888
Complete Specification Accepted, 23rd Nov., 1888
I, CHARLES AMBROSE MCEVOY of the London Ordnance Works, Bear Lane,
Southwark, in the County of Surrey, Engineer, do hereby declare the nature of this
invention to be as follows:-
In the Specification of a former Patent granted to ine dated 12th June 1879,
No. 2329 I described the forming of projectiles of hard metal with a projecting ring
or rings around them and with grooves formed around these raised rings so as to
reduce their circumference to a few narrow edges which on the projectile being fired
through a rifled barrel yield where they come against the rifling whilst the portions
opposite to the grooves of the rifling remain intact and give to the projectile a revolving
motion as it passes along the bore.
According to my present invention I form projectiles of iron steel phosphor bronze
or other comparatively hard metal with similar narrow raised edges around a portion
of their circumference not by cutting grooves around the circumference of projecting
rings previously formed around them, but by impressing grooves into the cylindrical
sides of the projectiles and thereby displacing metal and causing it to protrude
outwards from the circumference as a series of rings sufficiently raised to take the
rifling of small arms.
Preferably I form the grooves by rolling the projectiles between two surfaces on
one or other or both of which a series of parallel raised ribs are formed corresponding
to the grooves to be formed around the circumference of the projectile. For hard
metal projectiles of large diameter in place of surrounding them as heretofore for the
most part usual with a ring of copper held in a groove formed around them-I surround
them with a ring of iron or steel similarly held in a groove-by preference I put the
rings on hot so that they may on cooling obtain a very tight hold of the projectile.
Around the outer circumference of the ring I cut or roll as above described a series of
grooves so as to reduce the circumference to a number of narrow edges which will
yield on coming against the raised portions of the rifling of a rifled gun.
T
1000

page_text: I, CHARLES AMBROSE MCEVOY, of the London Ordnance Works, Bear Lane,
Southwark, in the County of Surrey, 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 :-
In the specification of a former patent granted to me dated 12th June 1879
No. 2329 I described the forming of projectiles of hard metal with a projecting ring
or rings around them and with grooves formed around these raised rings so as to
reduce their circumference to a few narrow edges which on the projectile being fired
through a rifled barrel yield where they come against the rifling whilst the portions
opposite to the grooves of the rifling remain intact and give to the projectile a revolving
motion as it passes along the bore.
According to my present invention I form projectiles of iron steel phosphor bronze
or other comparatively hard metal with similar narrow raised edges around a portion
of their circumference not by cutting grooves around the circumference of projecting
rings previously formed around them, but by impressing grooves into the cylindrical
sides of the projectiles and thereby displacing metal and causing it to protrude
outwards from the circumference as a series of rings sufficiently raised to take the
rifling of small arms.
Figure 1 is a side view of a projectile before having the grooves formed around it.
Figure 2 is a side view and Figure an end view of the projectile after that raised
rings have been formed around its rear end.
Preferably I form the grooves by rolling the projectiles between two surfaces on
one or other or both of which a series of parallel raised ribs are formed corresponding
to the grooves to be formed around the circumference of the projectile.
The surfaces between which the projectiles are rolled may be straight surfaces as
shown in the diagrams Figures 4 and 5 or they may be curved surfaces as illustrated
in Figure 6.
In Figures 4 and 5 A is a projectile upon which grooves are being impressed-B a
holder in which the point of the projectile is being held-C C are the grooved surfaces
which are made to bear against a portion of the circumference of the projectile and at
the same time are moved endwise one in one direction and the other in the opposite
direction.
In Figure 6 A is a projectile upon which grooves are being impressed-B is a fixed
curved bed with parallel ribs standing up from its surface-and C a roller with similar
ribs around its circumference-this roller is eccentric to the curved bed which admits
of the rear end of a projectile being inserted between the roller and bed where the
space between them is greatest and then as the roller is revolved the projectile will be
caused to roll along the bed to its opposite end and will be delivered at the end with
grooves formed around its circumference corresponding to the parallel projecting ribs
on the bed and roller.

page_text: The bed might be made circular as well as the roller and either one or other or both
might be made to revolve. The projectile being inserted between the two at one
point and withdrawn at another. Whilst the projectiles are being acted upon by the
roller and bed they may be kept parallel with the axis of the roller by being inserted
into holes in a disc which is free to revolve on an axis concentric with the bed.
For hard metal projectiles of large diameter in place of surrounding them as
heretofore for the most part usual with a ring of copper held in a groove formed
around them-I surround them with a ring of iron or steel similarly held in a groove
-by preference I put the rings on hot so that they may on cooling obtain a very tight
hold of the projectile. Around the outer circumference of the ring I cut or roll as
above described a series of grooves so as to reduce the circumference to a number of
narrow edges which will yield on coming against the raised portions of the rifling of a
rifled gun.
Figure 7 is a longitudinal section of a projectile with a ring of iron or steel shrunk
into a groove formed around its rear end-Figure 8 is a side view of the same
projectile with a series of parallel grooves cut or formed around the circumference of
the ring.
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 :-
1. Forming narrow projecting rings around a portion of the circumference of
projectiles of iron steel or other comparatively hard metal by impressing into it a
series of parallel grooves.
2. A hard metal projectile with a ring of iron or steel shrunk onto it and with
narrow parallel grooves cut or formed around the circumference of the ring.
Dated thin 17th L 1000