AN IMPROVED COM- POSITION FOR PREVENTING AND REMOVING INCRUSTATION IN BOILERS
Year: 1862

page_text: LETTERS PATENT to James Wilson, of North Brixton, in the County of
Surrey, Warehouseman, for the Invention of "AN IMPROVED COM-
POSITION FOR PREVENTING AND REMOVING INCRUSTATION IN BOILERS."
Sealed the 17th March 1863, and dated the 20th September 1862.
PROVISIONAL SPECIFICATION left by the said James Wilson at the
Office of the Commissioners of Patents, with his Petition, on the 20th
September 1862.
I, JAMES WILSON, of North Brixton, in the County of Surrey, Ware-
houseman, do hereby declare the nature of the said Invention for "AN
IMPROVED COMPOSITION FOR PREVENTING AND REMOVING INCRUSTATION IN BOILERS,"
to be as follows:-
The Invention consists of the employment of chemical precipitants for
the lime and silica, together with materials which prevent the precipitate from
caking and adhering to the bottom and sides of the boiler or tubes as hereafter
stated.
I employ a mixture of ground malt and woody fibres or other ligneous
matters also ground together with a carbonated alkali and oxalate of ammonia.
The latter two precipitate the lime and silicon, while the malt and ligneous
matters, aided by the constant ebullition in the boiler, prevent the precipitate
from settling and incrusting.
The proportions I adapt to the nature and qualities of the water; "for

page_text: instance, in the case of marine boilers, when salt water is used, I take a larger
proportion of the malt and ligneous matter, while for fresh and very hard
waters, a larger proportion of the precipitants is required.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Wilson in the Great Seal Patent Office on the
20th March 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
WILSON, of North Brixton, in the County of Surrey, Warehouseman, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twentieth day of September, in the year of our
Lord One thousand eight hundred and sixty-two, in the twenty-sixth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said James Wilson, Her special licence that I, the said James Wilson,
my executors, administrators, and assigns, or such others as I, the said James
Wilson, 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 Islands, and Isle of Man, an Invention for "AN IMPROVED COM-
POSITION FOR PRESERVING AND REMOVING INCRUSTATION IN BOILERS," upon
the condition (amongst others) that I, the said James Wilson, my exe-
cutors or administrators, by an instrument in writing under, my, or their,
or one of their hands and seals, 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 James Wilson, do hereby declare. the
nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement, that is to say:-
The Invention consists of the employment of chemical precipitants for the
lime and solvents for the silica, together with materials which prevent the
precipitate formed from caking and adhering to the bottom and sides of the
boiler or tubes, as hereafter stated.

page_text: I employ a mixture of ground malt and woody fibres, or other ligneous
matters also ground together with a caustic or a carbonated alkali, and oxalate
of ammonia, the latter two precipitate the lime and silica, while the malt and
ligneous matters, aided by the constant ebullition in the boiler, prevent the
precipitate from settling and incrusting.
The proportions, and to a certain extent the composition of the mixture, I
adapt to the nature and qualities of the water, as ascertained by analysis; for
instance, in the case of marine boilers, when salt water is used, I take à
larger proportion of the malt and ligneous matters, while for fresh and very
hard waters, a larger proportion of the precipitants is required.
In witness whereof, I, the said James Wilson, have hereunto set my
hand and seal, this Nineteenth day of March, in the year of our
Lord One thousand eight hundred and sixty-three.
5 Witness,
RICHARD SILVESTER,
18, Warwick Court,
Gray's Inn.
JAMES WILSON. (L.S.)