IMPROVEMENTS IN THE PREPARATION OF READILY FUSIBLE COMPOUNDS WHICH HARDEN ON COOLING, AND ARE USEFUL AS PROVISIONAL SPECIFICATION USEFUL AS CEMENT FOR CASTING IN MOULDS AND LIKE PURPOSES
Year: 1881

page_text: LETTERS PATENT to James D'Arcy, of Belvedere, in the County of Kent,
for an Invention of "IMPROVEMENTS IN THE PREPARATION OF READILY
FUSIBLE COMPOUNDS WHICH HARDEN ON COOLING, AND ARE USEFUL AS
PROVISIONAL SPECIFICATION left´by the said James D'Arcy at the Office
of the Commissioners of Patents on the 13th April 1881.
JAMES D'ARCY, of Belvedere, in the County of Kent. " IMPROVEMENTS IN THE
PREPARATION OF READILY FUSIBLE COMPOUNDS WHICH HARDEN ON COOLING,
AND ARE USEFUL AS CEMENT FOR CASTING IN MOULDS AND LIKE PURPOSES."
This Invention has for its object improvements in the preparation of readily
fusible compounds which harden on cooling, and are useful as cement for casting
in moulds and like purposes.
Compounds of this nature and applicable for these purposes are sometimes
prepared by mixing or combining metallic sulphides with sulphur.
According to my Invention I combine slag with sulphur.
The slag of which I make use is that obtained in the smelting of precipi-
tated copper. About two parts of sulphur to three parts of slag are suitablę
proportions.
The slag should be ground fine.
This material or amalgam is less liable to crack and to be disfigured by
exposure than the compound now in use, of sulphur with sulphide of iron or
pyrites.
I also employ bitumen together with the above mentioned materials. The
addition of bitumen enables me to reduce the proportion of sulphur, it gives greater
tenacity to the material, and delays the hardening.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said James D'Arcy in the Great Seal Patent Office on the 12th October
1881.
"
JAMES D'ARCY, of Belvedere, in the County of Kent. IMPROVEMENTS IN THE
PREPARATION OF READILY FUSIBLE COMPOUNDS WHICH HARDEN ON COOLING,
AND ARE USEFUL AS CEMENT FOR CASTING IN MOULDS AND LIKE PURPOSES."
This Invention has for its object improvements in the preparation of readily
fusible compounds which harden on cooling, and are useful as cement for casting
in moulds and like purposes.
Compounds of this nature and applicable for these purposes are sometimes
prepared by mixing or combining metallic sulphides with sulphur.
According to my Invention I combine or mix the refuse or slag from the melting
of the copper precipitate produced by Hendersons process with sulphur. This
refuse I first grind to a powder, then subject it to a temperature (in a suitable
furnace or calciner) sufficient to bring it to a dull red or black heat, which drives
off all moisture; I then, by means of a steam jacketted pan, dry the sulphur
thoroughly, which is afterwards placed in a suitable vessel. The hot refuse is
then added, which readily melts the sulphur; the whole is kept agitated, and in a
short time forms a thick plastic mass; the stirring is continued, and as the mixture
cools it becomes gradually thinner until it is quite liquid.
I employ from 30 to 40 per cent. of sulphur.
I also employ bitumen together with the above mentioned materials, the
addition of which enables me to reduce the proportion of sulphur. It gives greater
tenacity to the material, and delays the hardening when such is required, as in the
case of pipe jointing.
I employ from 1 to 2 per cent. of bitumen.
This mode of making the material does away with the countless blow holes to
be found in castings made with compounds of this nature, prevents the sulphur
from getting "charred" as when melted in an iron vessel and remaining in little
lumps. It contains only a maximum of 40 per cent. of sulphur compared with
65 per cent. in compounds made with sulphides, and is in consequence less likely
to crack, and should a fracture from any cause take place it is not affected by
atmospheric influences, such, for example, as the formation of iron sulphate so
damaging to subjects made with compounds of sulphur with metallic sulphides.
Having thus described the nature of my said Invention, and the manner of
performing the same, I would have it understood that I claim,―
First. My novel compound of copper precipitate refuse or slag and sulphur,
substantially as described.
Second. The combination of bitumen with such compound, substantially as
described.
:
In witness whereof, I, the said James D'Arcy, have hereunto set my hand
and seal, this Eleventh day of October, in the year of our Lord One
thousand eight hundred and eighty one.