PREVENTING AND REMOVING INCRUSTATIONS IN STEAM BOILERS
Year: 1859

page_text: LETTERS PATENT to Charles Fréderic Vasserot, of 45, Essex Street,
Strand, London, Patent Agent, for the Invention of "PREVENTING AND
REMOVING INCRUSTATIONS IN STEAM BOILERS."-A communication from Jean
Claude Chavanne, residing in Lyons, in the Empire of France.
PROVISIONAL SPECIFICATION left by the said Charles Frederic Vasserot
at the Office of the Commissioners of Patents, with his Petition, on
the 25th July 1859.
I, CHARLES FREDERIC VASSEROT, of 45, Essex Street, Strand, London,
Patent Agent, do hereby declare the nature of the said Invention for " PRE-
VINTING AND REMOVING INCRUSTATIONS IN STEAM BOILERS," (a communication
from Jean Claude Chavanne, residing at Lyons, in the Empire of France), to
be as follows:-
The object of this Invention is to prevent and remove the incrustation
formed within steam boilers or steam generators. For this purpose the extract.
of chesnut (of the strength of 20 or 22 degrees) is employed. If the crust in
the boiler is very thick, the quantity of the extract which I prefer to use is
one part of the extract to 100 parts of water in the boiler, when the crust has
been removed or detached by the action of the extract, it suffices to place daily

page_text: in the boiler one part in volume of extract to 1000 parts of water in the boiler,
and no lime or incrustation will accumulate on the sides of the boiler, which will
be kept perfectly clean; the deposit on the bottom will be a kind of slush,
which may be easily washed away by the blow-off cock.
The principal basis of the extract of chesnut being the gallic and tannic acids,
1 can employ any other vegetable containing these two acids.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Charles Fréderic Vasserot in the Great Seal Patent Office.
on the 25th January 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
FREDERIC VASSEROT, of 45, Essex Street, Strand, London, Patent Agent, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fifth day of July, in the year of our Lord One
thousand eight hundred and fifty-nine, in the twenty-third year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Charles Fréderic Vasserot, Her special license that I, the said
Charles Frederic Vasserot, my executors, administrators, and assigns, or
such others as I, the said Charles Fréderic Vasserot, my executors, adminis-
trators, 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 Inven-
tion for "PREVENTING AND REMOVING INCRUSTATIONS IN STEAM BOILERS," a
communication from Jean Claude Chavanne, residing in Lyons, in the Empire
of France, upon he condition (amongst others) that I, the said Charles
Frederic Vasserot, by an instrument in writing under my hand and seal,
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 l'atent.
NOW KNOW YE, that I, the said Charles Frederic Vasserot, 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, that is to say :-
The object of this Invention is to prevent and remove the incrustation

page_text: formed within steam boilers or steam generators. For this purpose the extract
of chesnut tree (of the strength of 20 or 22 degrees) is employed. If the crust
in the boiler is very thick, the quantity of the extract which I prefer to use is,
one part of the extract to one hundred parts of water in the boiler, and when
the crust has been removed or detached by the action of the extract, it suffices
to place daily in the boiler one part in volume of extract to a thousand parts
of the water in the boiler, and no lime or incrustation will accumulate on the
sides of the boiler, which will be kept perfectly clean; the deposit on the
bottom will be a kind of slush, which may be easily washed away by the blow-
off cock.
The principal basis of the extract of chesnut tree, being the gallic acid, I
can employ any other vegetable containing this acid.
Having now described the Invention and explained the means of carrying
the same into effect, as communicated to me, I claim the application and use
of the extract of chesnut tree to prevent and remove the incrustation in steam
boilers and steam generators, as herein described.
In witness whereof, I, the said Charles Fredéric Vasserot, have hereunto
set my hand and seal, this Sixteenth day of January, in the year of
our Lord One thousand eight hundred and sixty.
CH. TRED. VASSEROT. (LS.)