IMPROVEMENTS IN THE TREATMENT OF SULPHUR ORES
Year: 1875

page_text: LETTERS PATENT to Alexander Angus Croll, commonly known as
Colonel Croll, of Coleman Street, in the City of London, for the
Tof is TYG V MY TONAMERN OF SHYDUND ADEO "
PROVISIONAL SPECIFICATION left by the said Alexander Angus Croll
at the Office of the Commissioners of Patents, with his Petition,
on the 10th April 1875.
I, ALEXANDER ANGUS OROLL, commonly known as Colonel Croll, of
Coleman Street, in the City of London, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN THE TREATMENT OF SULPHUR
ORES," to be as follows:-
The object of the Invention is to subject ores containing sulphur to a
certain degree of heat obtained by the passage of atmospheric air through
charcoal, coke, or other carbonaceous matter in the state of ignition.
For this purpose the chamber for the ignited carbonaceous matter is in
direct communication with one, or it may be several close chambers con-
taining the sulphur ore to be acted upon.

page_text: To facilitate the action of the heat on the ore such ore is previously
broken up into comparatively small particles, and these are supported
on grating or reticulate work, the openings through which are close
enough to prevent the particles of ore passing through, whilst they yot
admit of the free passage of the fluid sulphur obtained by the action t
of the heat.
As it is desirable that the temperature of the heated air brought in
contact with the ore should be maintained at 240 degrees Fahrenheit, or
thereabouts, the temperature at which the sulphur is most liquid, and
will most freely separate from the ore, 1 apply regulators between the
heating chamber and the chamber or chambers containing the sulphur
ore, so as to regulate the heat employed.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alexander Angus Croll in the Great Seal Patent
Office on the 9th October 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER'
ANGUS CROLL, commonly known as Colonel Croll, of Coleman Street,
in the City of London, send grecting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Tenth day of April, in the year of
our Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Alexander Angus Croll, Her special
license, that 1, the said Alexander Angus Croll, my executors, ad-
ministrators, and assigns, or such others as I, the said Alexander Angus
Croll, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times there-
after during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN THE TREATMENT OF SULPHUR ORES," upon the condition
(amongst others) that I, the said Alexander Angus Croll, my executors

page_text: or administrators, by an instrument in writing under my, or their, or
one of their hands and scals, should particularly describe and ascertain
the nature of the said Invention, and in what manner the same was to
be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date
of the said Letters Patent.
NOW KNOW YE, that I, the said Alexander Angus Croll, do hereby
declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained
in and by the following statement thereof, that is to say
The object of the Invention is to subject ores containing sulphur to a
certain degree of heat obtained by the passage of atmospheric air through
charcoal, coke, or other carbonaceous matter in the state of ignition.
For this purpose the chamber for the ignited carbonaceous matter is
in direct communication with one or it may be soveral close chambers
containing the sulphur ore to be acted upon.
To facilitate the action of the heat on the ore such ore is previously
broken up into comparatively small particles, and these are supported
on grating or reticulate work, the openings through which are close
enough to prevent the particles of ore passing through, whilst they yet
admit of the free passage of the fluid sulphur obtained by the action of
the heat.
As it is desirable that the temperature of the heated air brought in
contact with the ore should be maintained at 240 degrees Fahrenheit, or
thereabouts, the temperature at which the sulphur is most liquid, and
will most freely separate from the orc, I apply regulators to regulate the
admission of air to the heating chamber.
The desired current of atmospheric air may be obtained through the
fire by forcing or drawing it in various ways, as is well understood.
In witness whereof, I, the said Alexander Angus Croll, have
hereunto set my hand and seal, this Eighth day of October,
in the year of our Lord One thousand eight hundred and seventy-
five.