IMPROVEMENTS IN CARTRIDGES FOR BLASTING PURPOSES
Year: 1879

page_text: LETTERS PATENT to John Henry Johnson, of 47, Lincoln's Inn Fields, in the
County of Middlesex, Gentleman, for the Invention of "IMPROVEMENTS IN
CARTRIDGES FOR BLASTING PURPOSES." A communication from abroad by
T. N. Heidemann, of Cologne on the Rhine, in the Empire of Germany.
Sealed the 4th November 1879, and dated the 19th August 1879.
PROVISIONAL SPECIFICATION left by the said John Henry Johnson at the
Office of the Commissioners of Patents on the 19th August 1879.
JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Middlesex,
Gentleman. "IMPROVEMENTS IN CARTRIDGES FOR BLASTING PURPOSES." A
communication from abroad by T. N. Heidemann, of Cologne on the Rhine, in
the Empire of Germany.
This Invention relates to improved means for augmenting the effect of the charge
in holes drilled. for blasting purposes. With this object the inventor employs
cartridges of compressed blasting powder, manufactured as hereinafter described.
Powder prepared in the usual manner from salt petre, sulphur, and carbon, is first
brought to a high degree of specific gravity, that is to say, from 1.72 to 1.75, by
means of hydraulic pressure. The powder, after being granulated in a granulating
machine, is then pressed in metal moulds when in a wet condition by very powerful
mechanical pressure, whereby it is formed into cartridges of a high specific gravity
of from 1.70 to 1.72 of suitable length, and of a diameter corresponding to that of
the hole in which the cartridge is to be used. An opening is provided in the middle
or at the side of the cartridge for the insertion of the fuze.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Henry Johnson in the Great Seal Patent Office on the 19th
February 1880.
A
JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Middlesex,
Gentleman. "IMPROVEMENTS IN CARTRIDGES FOR BLASTING PURPOSES."
communication from abroad by T. N. Heidemann, of Cologne on the Rhine, in the
Empire of Germany.
The said Invention relates to improved means for augmenting the effect of the
charge in holes drilled for blasting purposes, and it has reference to the use for these
purposes of cartridges of compressed blasting powder, manufactured as hereinafter
described.
In carrying out the said Invention, powder prepared in the usual manner from
salt petre, sulphur, and carbon, is first brought to a high degree of specific gravity,
The powder
that is to say, to from 1.72 to 1.75, by means of hydraulic pressure.
thus compressed is next granulated in any suitable granulating machine and wetted,
and when in the wet granulated condition is subjected to pressure in metal moulds
by powerful mechanical means, whereby the powder is forined into cartridges (of a
round or polygonal section) of the required high specific gravity and of suitable
length, and of a diameter or width corresponding to that of the hole in which the
cartridge is to be used. An opening is provided in the middle or at the side of the
cartridge for the insertion of the fuze.
Having now described and particularly ascertained the nature of the said
Invention, and the manner in which the same is or may be used or carried into
effect, I would observe in conclusion that what I consider to be novel and original,
and therefore claim as the Invention secured to me by the herein before in part
recited Letters Patent is,
The manufacture of cartridges of compressed powder for blasting purposes from
granulated powder in a wet condition, the cartridge being made of a diameter or
width corresponding to that of the hole in which it is to be used, substantially as
hereinbefore described.
In witness whereof, I, the said John Henry Johnson, have hereunto set ny
hand and seal, the Nineteenth day of February; One thousand eight
hundred and eighty.