AN IMPROVED MEANS FOR PREVENTING AND REMOVING THE SCALE IN BOILERS
Year: 1872

page_text: LETTERS PATENT to Robert Longley, of Worsbrough Dale, near
Barnsley, in the County York, for the Invention of "AN IMPROVED
MEANS FOR PREVENTING AND REMOVING THE SCALE IN BOILERS."
Sealed the 14th March 1873, and dated the 30th December 1872.
PROVISIONAL SPECIFICATION left by the said Robert Longley at the
Office of the Commissioners of Patents, with his Petition, on the
30th December 1872.
I, ROBERT LONGLEY, of Worsbrough Dale, near Barnsley, in the
County of York, do hereby declare the nature of the said Invention
for "AN IMPROVED MEANS FOR PREVENTING AND REMOVING THE SCALE IN
BOILERS," to be as follows:-
My improvements consist in a combination of several substances, as
hereafter described, which I inject into the boiler. This composition
mixes with the water in the boiler and thereby is brought in contact
with the "scale," which is removed, loosened, or prevented from forming
on the plates by the chemical action of the composition. The ingredients
contained therein are as follows:-The principal ingredient is the liquid

page_text: known as
"
raw liquor," which is extracted from oak, ash, elm, larchi,
and "black dogwood." To obtain this ingredient the wood is placed
in a heated oven or retort, which is closed up, the steam or evaporation
which takes place is passed in a condenser and there deposited in the
form of a liquid, known as 'raw liquor." To the above liquor is added
oil of tar, in the proportions of about one gallon of tar to one hundred
gallons of raw liquor. The ingredients are thoroughly mixed together
and when required injected into the boiler to the extent of about half a
gallon per horse power.
The quantity of the ingredients used in forming the composition of
course may be varied in accordance with the quantity or nature of the
scale or incrustation. When the composition is supplied at the com-
mencement of the working of the boiler and continued as may be
required the scaling or incrustation is prevented. But when required to
remove the incrustation after being formed and adhering to the plates
the composition should be injected by means of an injector, or its
equivalent, a few days before tapping the boiler for the purpose of
cleaning it.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Robert Longley in the Great Scal Patent Office
on the 30th June 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
LONGLEY, of Worsbrough Dale, near Barnsley, in the County of York,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirtieth day of December, in the
year of our Lord One thousand eight hundred and seventy-two, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Robert Longley, Her special licence
that I, the said Robert Longley, my executors, administrators, and
assigns, or such others as I, the said Robert Longley, my executors,
administrators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter 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

page_text: Islands, and Isle of Man, an Invention for "AN IMPROVED MEANS FOR
PREVENTING AND REMOVING THE SCALE IN BOILERS," upon the condition
(amongst others) that I, the said Robert Longley, my executors 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 Scal Patent
Office within six calendar months next and immediately after the dato
of the said Letters Patent.
NOW KNOW YE, that I, the said Robert Longley, do hereby declare
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement :-
My improvements consist in a combination of several substances, as
hereafter described, which I inject into the boiler. This composition
mixes with the water in the boiler and thereby is brought in contact
with the scale, which is removed, loosened, or prevented from forming
on the plates by the chemical action of the composition. The ingredients
contained therein are as follows:-The principal ingredient is the liquid
known "
as raw liquor," which is extracted from oak, ash, elm, larch,
and "black dogwood." To obtain this ingredient the wood is placed in
a heated oven or retort, which is closed up, the steam or evaporation
which takes place is passed in a condenser and there deposited in the
form of a liquid known as "raw liquor." To the above liquor is added
oil of tar in the proportions of about one gallon of tar to one hundred
gallons of raw liquor.
In some cases when required I add common soda to. the extent of
about 40 pounds to 100 gallons of the liquor. The ingredients are
thoroughly mixed together, and when required injected into the boiler
to the extent of about half a gallon per horse power.
The quantity of the ingredients used in forming the composition may
of course be varied in accordance with the quantity or nature of the
scale or incrustation. When the composition is supplied at the com-
mencement of the working of the boiler and continued as may be
required, the scaling or incrustation is prevented. But when required
to remove the incrustation after being formed and adhering to the plates
the composition should be injected by means of an injector, or its

page_text: equivalent, a few days before tapping the boiler for the purpose of
cleaning it.
•
Having now described the nature of the said Invention, and the
manner in which the same is to be performed, I would remark in
conclusion that I do not limit myself to the exact quantities specified, as
the same may be varied or modified without in any way departing from
the nature of my Invention; but what I do claim and desire to be
secured to me by Letters Patent is, the manufacture and employment of a
boiler composition consisting of raw liquor and oil of tar, with or without
the admixture of soda, all in or about the proportions named.
In witness whereof, I, the said Robert Longley, have hereunto set
my hand and seal, this Twenty-fifth day of June, in the year of
our Lord One thousand eight hundred and seventy-three.