Improvements in Projectiles.
Year: 1898

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6.
Date of Application, 11th Mar., 1898 Accepted, 30th Apr., 1898
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Improvements in Projectiles.
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We, GEORGES ROTII, of 50, Rennweg, Vienna III/4, Ammunition: Manufacturer,
and CHARLES KRNKA, of 14, Erzherzog Carlsplatz, Vienna, Austria, Engineer, do
hereby declare the nature of our invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement:
The present, invention relates to improvements in projectiles as herein after
particularly described and pointed out in the claim.
And in order to render the present specification more easily intelligible reference
is had to the accompanying drawing, in which similar letters of reference denote
similar parts throughout the several views:
Fig. 1, a to shows various cross sections of the projectile,
Figs. 2, 4, 5 show, longitudinal sections of the projectile in its various forms
of embodiment,
Figs. 3 and 6 are side elevations of modified forms,
Figs. 7 and 8 are cross sections showing two different forms of the interior barrel
cross section.'
A
The object of the present invention is to diminish the resistance offered to the
projectile by the air and the object struck, and in order to attain this object the
body of the projectile is provided with longitudinal or approximately longitudinal
depressions.
The depressions, r, which are advantageously few in number, should be sym-
metrically arranged and should be deep so that their lowest point extends as far
as possible towards the centre line of the projectile.
The section of the projectile will vary according to the number and depth of
these depressions, as will be clearly seen from Figure 1, a to k.
The depressions may run parallel to the longitudinal axis of the projectile
as shown at Figures 2, 4 and 5 or they may be skew to the same as shown at
Figures 3 and 6 in which case they are spirally arranged.
In order to prevent the gases of explosion from escaping along the depressions
formed, the projectile is provided with an end pieces of any suitable material
as shown at Figures 2 and 4. Instead of the end piece, the depressions or grooves?
may be terminated before the end of the projectile, i.e. they may be so formed
as to leave an end piece as shown at Figures 5 and 6.
The projectile may be pointed at both ends as shown at Figs. 4 and 6, but in
the case of Figure 4 an end disc s would have to be provided.
If the grooves r are longitudinally arranged or are twisted in the opposite
direction to the twist of the rifling of the barrel, these projectiles may be used
in connection with any cross section of barrel as at present generally employed and
some forms of which are illustrated in Figures 7 and 8.
1f, however the grooves are twisted in the same direction as the rifling of the
barrel, it is advantageous to employ a polygonal cross section of barrel as shown
Wouse7

page_text: If the latter form of barrel is employed, all the projectiles shown in Figures a
to k may be alternately employed in connection with the same, if the grooves r are
wound or twisted to the same angle as the twist of the rifling..
Thus, for instance, if a projectile having the cross section is projected from a
barrel having the cross section of Figure 7 the four sides or edges of the projectile
will guide the same along the rifling of the barrel, whilst if the projectile of
section is employed only three sides or edges of the same would effect the guidance
in equally effective manner.
If projectiles having sections a to k are to be employed in connection with a
barrel having the cross section shown at Figure 8 (ie. with riflings and inter-
mediate ribs,) it is advantageous to leave the ends of the projectiles full as shown
at Figures 5 and 6.
The projectiles may be made of a suitable harder class of metal or of lead or
hard lead, having a steel, copper or nickle mantle.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:
1-A projectile, having grooves formed in its surface in a longitudinal
direction, said grooves being cut down as near as possible to the longitudinal
centre of the projectile and running either longitudinally of the same or skew
as specified, for the purpose of reducing the effect of the resistance of the air and
of the object struck, substantially as described.
2A projectile constructed substantially as described and illustrated in the
accompanying drawings for the purpose specified.
Dated this 11th day of March 1898
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.