IMPROVEMENTS IN PROJECTILES, AND IN THE MANUFACTURE THEREOF.
Year: 1872

page_text: LETTERS PATENT to Robert Boyd, of the Firm of Herbert and Co.,.
of 67, Strand, in the City of Westminster, Patent Agents, for the
Invention of "IMPROVEMENTS IN PROJECTILES, AND IN THE MANUFACTURE
THEREOF. ."-A communication from abroad by David Wallace, of
Kamthi, Central Provinces, India.
COMPLETE SPECIFICATION filed by the said Robert Boyd at the Office
of the Commissioners of Patents, with his Petition and Declaration,
on the 18th June 1872, pursuant to the 9th Section of the Patent
Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
BOYD, of the Firm of Herbert and Co., of 67, Strand, in the City of
Westminster, Patent Agents, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS
IN PROJECTILES AND IN THE MANUFACTURE THEREOF," and have petitioned
Her Majesty to grant unto me, my executors, administrators, and
assigns, Her Royal Letters Patent for the same, and have made solemn

page_text: Decal Communicate road by Davi
Wallace, of Kamthi, Central Provinces, India.
NOW KNOW YE, that I, the said Robert Boyd, do hereby declare
that the following Complete Specification, under my hand and seal,
fully describes and ascertains the nature of the said Invention, and
in what manner the same is to be performed, in and by the following
statement:-
The improvements consist in the application to projectiles and use
of a permanent core of any material lighter in gravity than the pro-
jectile itself, and in constructing such projectiles, or hollow projectiles
generally in such manner that the core may be more conveniently placed
and centered and held therein than heretofore, the object of the improve-
ments being to impart to projectiles a higher initial velocity than at
present attained in the use of same solid contents of projectile with
equal charge of powder.
The improvements may be performed by making the core a miniature
of the projectile in clay by means of a suitable mould, or instead of clay
any other material that will cast or mould or otherwise, and be lighter
in gravity than the hollow projectile itself, may be used. Into or
through the minature or core is introduced or fixed when the clay
or other material is soft or otherwise a thin piece or strip of lead, or
other suitable material of any convenient shape may be used, which
may project on either side of the miniature or core, and small studs
or pins of lead or other suitable material inserted, or any desired holes,
grooves, or indentations may be made and left in or on the miniature:
or core.
The core treated as above is then placed in the centre of a mould the
size and shape of the projectile, the strip of lead or other material as
above described being sometimes allowed to project from the core a
distance equal to the thickness of the outside material of the projectile,
or it may be longer and fit into holes in the case of the mould. Molten
metal is then run or forced into or through the mould, and thus a
coating of metal is formed over the miniature projectile or core equal in
thickness to the space between the core and the inside casing of the
mould. The projectile is thus formed, and it is only necessary to trim:
off the projections (if any).

page_text: When I require a projectile of sufficient thickness to take the rifling
or grooves of the gun in which it is to be used or for other purposes, I
take care to leave sufficient space between the outside of the core and
inside of the mould.
Sometimes I make the outside case of the projectile in two or more
pieces, either by casting, or by pressure in a mould or moulds, and
envelope the core in such pieces, or insert the core between such pieces,
which may be forced together or otherwise made to close up and form
one case enclosing the core.
The accompanying Drawing will serve to further illustrate the im-
provements, the Figures being shewn in section.
a, in Figures 1, 2, 3, and 4 is a thin piece of metal serving to fix the
core in mould; b is the casing or outside of the projectile; c, the core.
Figure 2 is the core for Figure 1, and Figure 4 core for Figure 3.
Figure 5 shews projectile made in this case in two pieces and without
the thin picce of metal a.
In witness whereof, I, the said Robert Boyd, have hereunto set my
hand and seal, this Eleventh day of June, in the year of our Lord
One thousand eight hundred and seventy-two.