AN IMPROVED COMPOSITION FOR REMOVING AND PRE- VENTING INCRUSTATION IN BOILERS
Year: 1873

page_text: LETTERS PATENT to David Hutchison, of Mile End, and William
George Bridges, of Stepney, both in the County of Middlesex, for
the Invention of "AN IMPROVED COMPOSITION FOR REMOVING AND PRE-
VENTING INCRUSTATION IN BOILERS."
Sealed the 29th April 1873, and dated the 14th February 1873.
PROVISIONAL SPECIFICATION left by the said David Hutchison and
William George Bridges at the Office of the Commissioners of
Patents, with their Petition, on the 14th February 1873.
We, DAVID HUTCHISON, of Mile End, and WILLIAM GEORGE BRIDGES,
of Stepney, both in the County of Middlesex, do hereby declare the
nature of the said Invention for "AN IMPROVED COMPOSITION FOR REMOVING
AND PREVENTING INCRUSTATION IN BOILERS," to be as follows:-
This Invention consists in combining together the following in-
gredients, matters, or substances in the manufacture of an improved
composition suitable for removing and preventing incrustation in boilers
without injuriously affecting the metal of which the boilers are made.
The following are the ingredients we propose to employ for the aforesaid

page_text: improved composition, namely, catechu, chlorine, linseed, sodium, nitre,
sulphate of potash, alum, calcium, and ammonia, in about the following
proportions :-
Catechu
Chlorine
Linseed
Sodium
Nitre
-
32 parts
-
24
"
->
- 16
"
-
8
"
-
8
"
8
"
4
"
-
Sulphate of potash
Alum
Calcium
•
Ammonia
"
•
2
"
We first mix the chlorine, linseed, and catechu together in any
suitable vessel. Then mix together the other ingredients above named
and add them to and thoroughly mix and incorporate them with the first-
named mixture of chlorine, linseed, and catechu. The above composi-
tion we propose to place in the boiler in the proportion of about one
pound per horse-power of the boiler.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said David, Hutchison and William George Bridges,
in the Great Seal Patent Office on the 14th August 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, DAVID
HUTCHISON, of Mile End, and WILLIAM GEORGE BRIDGES, of Stepney,
both in the County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of February, in the
year of our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said David Hutchison and William George
Bridges, Her special licence that we, the said David Hutchison and
William George Bridges, our executors, administrators, and assigns, or
such others as we, the said David Hutchison and William George
Bridges, our 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, a

page_text: Having now described the nature of our said Invention for "An
Improved Composition for Removing and Preventing Incrustation in
Boilers," and the means by which it may be effected, we would remark
in conclusion that we do not intend to limit or confine ourselves to the
exact proportions of the ingredients above described as the same will
require to be varied to suit the quality of the water to be operated upon
by the said compound; and in some cases it will be found desirable to
omit some of the said ingredients, and increase the proportions of some
and diminish that of others. We also reserve the right to employ other
ingredients not named in our Specification, but which possess similar
chemical properties to those above enumerated.
And we hereby declare our Invention to consist in, and we claim,
manufacturing a compound suitable for removing and preventing in-
crustation in boilers by combining together the ingredients above stated
in the manner and proportions above described in the manufacture of a
compound adapted for general use.
In witness whereof, I, the said William George Bridges, one of
the parties hereto, have hereunto set my hand and seal, this
Thirteenth day of August, in the year of our Lord One thousand
eight hundred and seventy-three.