IMPROVEMENTS IN PURIFYING ILLUMINATING COAL GAS AND IN THE PREPARATION OF THE MEANS EMPLOYED THEREFOR
Year: 1876

page_text: LETTERS PATENT to Samuel Hallsworth, of Armley, near Leeds, and Richard
Bailes, of Woodhouse Carr, near Leeds, both in the County of York, for the
Invention of "IMPROVEMENTS IN PURIFYING ILLUMINATING COAL GAS AND
IN THE PREPARATION OF THE MEANS EMPLOYED THEREFOR."
Sealed the 22nd August 1876, and dated the 1st March 1876.
PROVISIONAL SPECIFICATION left by the said Samuel Hallsworth and
Richard Bailes at the Office of the Commissioners of Patents on the 1st March
1876.
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SAMUEL HALLSWORTH, of Armley, near Leeds, and RICHARD BAILES, of Wood-
house Carr, near Leeds, both in the County of York. IMPROVEMENTS IN PURI-
FYING ILLUMINATING COAL GAS AND IN THE PREPARATION OF THE MEANS
EMPLOYED THEREFOR."
Our Invention consists in the preparation and use of the residue that remains
after iron pyrites are burnt in the manufacture of sulphuric acid. Also in the
use of oxide of iron refuse that remains after the spent oxide obtained from gas
works has been burnt in furnaces.
We use the above-named residue of burnt iron pyrites that may have been
placed upon a bed or heap and exposed to the weather for a considerable time,
and such as is used in the manufacture of copperas or other purposes, as stated
in the Specification of our Patent,. dated May 11th 1875, No. 1752, or we take
the before-named residue of burnt iron pyrites and place them upon a bed or
heap, and allow them to be exposed to the weather for a long time. By being
so exposed a chemical change takes place, which renders them better adapted for
the purpose for which they are employed.
Or we take the before-named residue of burnt iron pyrites in the state in which
they come from the furnaces after being used in the manufacture of sulphuric acid
and grind them in a mortar mill, or they may be crushed to a powder by any
other suitable means.
We take the above-named residue of burnt iron pyrites after being exposed to
the weather as before stated, and pass it through a sieve of about three-eighths or
half inch mesh, and grind the lumps as before stated.
We also use the oxide of iron refuse that remains after the spent oxide obtained
from gas works has been burnt in furnaces.
1

page_text: To about two parts by measure of the sifted or ground residue of burnt iron
pyrites, or of burnt oxide of iron refuse, we add from about one to one and a
quarter parts of sawdust or other equivalent, and slightly moisten the mass with
water, and well mix together. The material should be so moistened with water
that it will ball together when pressed in the hand without wetting it.
The compound is placed in the ordinary purifiers and allowed to remain in them
until it ceases to purify the gas. It is then taken out and spread upon the floor
and allowed to revivify and cool. It is slightly moistened with water each time
before being used again. By these means it can be used over and over again until
it becomes so mixed with sulphur as to be too heavy for use.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Samuel Hallsworth and Richard Bailes in the Great Seal Patent Office
on the 29th August 1876.
SAMUEL HALLSWORTH, of Armley, near Leeds, and RICHARD BAILES, of Wood-
house Carr, near Leeds, both in the County of York. " IMPROVEMENTS IN PURI-
.FYING ILLUMINATING COAL GAS AND IN THE PREPARATION OF THE MEANS
EMPLOYED THEREFOR,"
Our Invention consists in the preparation and use of the residue that remains
after iron pyrites are burnt in the manufacture of sulphuric acid. Also in the
use of oxide of iron refuse that remains after the spent oxide obtained from gas-
works has been burnt in furnaces.
We use the above-named residue of burnt iron pyrites that may have been
placed upon a bed or heap and exposed to the weather for a considerable time,
and such as is used in the manufacture of copperas or other purposes, as stated
in the Specification of our Patent, dated May 11th 1875, No. 1752, or we take
the before-named residue of burnt iron pyrites and place them upon a bed or
heap, and allow them to be exposed to the weather for a long time. By being
so exposed a chemical change takes place which renders them better adapted for
the purpose for which they are employed.
Or we take the before-named residue of burnt iron pyrites in the state in which
they come from the furnaces after being used in the manufacture of sulphuric
acid and grind them in a mortar mill, or they may be crushed to a powder by any
other suitable means.
We take the above-named residue of burnt iron pyrites after being exposed to
the weather as before stated, and pass it through a sieve of about three-eighths or
half an inch mesh, and grind the lumps as before stated.
We also use the oxide of iron refuse that remains after the spent oxide obtained
from gas works has been burnt in furnaces.
To about two parts by measure of the sifted or ground residue of burnt iron
pyrites, or of burnt oxide of iron refuse, we add from about one. to one and a
quarter parts of sawdust or other equivalent, and slightly moisten the mass with
water, and well mix together. The material should be so moistened with water
that it will ball together when pressed in the hand without wetting it.
The compound is placed in the ordinary purifiers and allowed to remain in
them until it ceases to purify the gas. It is then taken out and spread upon the
floor and allowed to revivify and cool. It is slightly moistened with water each
time before being used again. By these means it can be used over and over again
until it becomes so mixed with sulphur as to be too heavy for use.
Having now described the nature of our said Invention, and described how the
same may be performed, what we do claim and desire to be secured to us by.
Letters Patent is-
First. The combination of the various ingredients forming the compound for
purifying illuminating coal gas, substantially as herein set forth.

page_text: Second. The mode of preparing the compound, substantially as herein set forth.
In witness whereof, I, the said Samuel Hallsworth, for myself, and on behalf
of the said Richard Bailes, have hereunto set my hand and seal, this
Twenty-sixth day of August, in the year of our Lord One thousand eight
hundred and seventy-six.
SAMUEL HALLSWORTH. (L.S.)