A NEW AND IMPROVED PROCESS FOR PREVENTING INCRUSTATION IN STEAM BOILERS
Year: 1871

page_text: LETTERS PATENT to Charles Touaillon, of Paris, France, Civil Engineer,
for the Invention of "A NEW AND IMPROVED PROCESS FOR PREVENTING
INCRUSTATION IN STEAM BOILERS."-A communication from Pierre
Victor Vigier, residing at 72, Boulevard Sébastopol, Paris, France,
Chemist.
Sealed the 30th April 1872, and dated the 9th December 1871.
COMPLETE SPECIFICATION filed by the said Charles Touaillon at the
Office of the Commissioners of Patents, with his Petition and Decla-
ration, on the 9th December 1871, pursuant to the 9th Section of
the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
TOUAILLON, of Paris, France, Civil Engineer, send greeting.
WHEREAS I am in possession of an Invention for "A NEW AND
IMPROVED PROCESS POR PREVENTING INCRUSTATION IN STEAM BOILERS," commu-
nicated to me by Pierre Victor Vigier, a person resident at 72, Boulevard
Sébastopol, Paris, France, Chemist, and have petitioned Her Majesty to
grant unto me, my executors, administrators, and assigns, Her Royal

page_text: Letters Patent for the same, and made solemn Declaration that it is a
communication.
NOW KNOW YE, that I, the said Charles Touaillon, do hereby declare
that the following Complete Specification, under my hand and seal,
fully describes and ascertains the nature of the Invention, and the
manner in which the same is to be performed, that is to say :-
The Invention, communicated to me relates to a new and improved
process for preventing incrustation in steam boilers, originated by the
evaporation of the natural waters, and consists in employing pulverized
and sifted talc or steatite for that purpose.
According to the nature of the waters, more or less incrustating, that
are to be employed, about 1 to 2 drams, (3 to 5 grammes) of pul-
verized talc or steatite are used to about a quart (1 litre) of water.
This powder is diluted in a very small quantity of liquid in order to
make a very thin paste, which is simply poured into the feeding water
well; this operation is repeated as many times as the boiler holds quarts
of water, by taking precautions to stir from time to time the liquid in
the feeding water well, by which the talc or steatite is forced with
certainty into the boiler. After the necessary quantity of paste has
been poured into the water well the boiler is feed as usual, without it
being necessary to add again talc or steatite. The boiler is cleaned
out at frequent intervals, say once a week, for example, and when the
water is under an atmospheric pressure of one and a half, and by simply
opening the purging cock of the boiler. If a better cleaning is desired
the manhole of the boiler is opened in order to stir up the deposited
mud, which can be more easily cleaned out.
By using talc or steatite for preventing ordinary incrustation in
steam boilers, several advantages are thereby obtained, which can thus
be sumed up.
1ly. This substance being neither acid nor alkaline does not attack
in any way the metallical surfaces with which it is in contact. This is
a capital advantage.
2dly. It is relatively light and insoluble, and is found again wholly
in the deposited mud extracted from the boiler, mixed with the pul-
verulent sedimens, by which the cretaceous incrustations are ordinarily

page_text: 3dly. It is very abundant, and of an insignificant price, comparatively
to the varions substances employed up to the present time, with results
very variable, and more or less advantageous.
Having thus described the nature of the said Invention, and the
manner in which the same is to be performed, and what I claim is the
employing of pulverized and sifted talc or steatite, for preventing
incrustation in steam boilers.
In witness whereof, I, the said Charles Touaillon, have hereto set
my hand and seal, this Twenty-fifth day of November, in the
year of our Lord One thousand eight hundred and seventy-one.
CH. TOUAILLON. (L.S.)