IMPROVEMENTS IN PREVENTING INCRUSTATION OF STEAM BOILERS
Year: 1853

page_text: LETTERS PATENT to Edward Duclos de Boussois, of Paris, Mining
Engineer, for the Invention of "IMPROVEMENTS IN PREVENTING
INCRUSTATION OF STEAM BOILERS."
Sealed the 19th August 1853, and dated the 28th May 1853.
PROVISIONAL SPECIFICATION left by the said Edward Duclos
de Boussois at the Office of the Commissioners of Patents, with
his Petition, on the 28th May 1853.
I, EDWARD DUCLOS DE BOUSSOIs, of Paris, Mining Engineer, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
PREVENTING INCRUSTATION OF STEAM BOILERS" to be as follows:-
Heretofore, amongst other matters, muriatic acid has been applied
in some cases to the purpose of preventing incrustation in boilers,
and in other cases muriate of barytes has been used for like purposes.
Now, the object of my Invention is to combine the use of muriatic
acid and muriate of barytes at one and the same time, by which means
more beneficial results are obtained.

page_text: SPECIFICATION in pursuance of the conditons of the Letters Patent,
filed by the said Edward Duclos de Boussois in the Great Seal
Patent Office, on the 28th November 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
EDWARD DUCLOS DE BOUSSOIS, of Paris, Mining Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-eighth day of May, in the
year of our Lord One thousand eight hundred and fifty-three, in the
sixteenth year of Her reign, did, for Herself, Her heirs and succes-
sors, give and grant unto me, the said Edward Duclos de Boussois,
Her special licence that I, the said Edward Duclos de Boussois,
my executors, administrators, and assigns, or such others as I, the
said Edward Duclos de Boussois, 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 "IMPROVEMENTS IN PREVENTING
INCRUSTATION IN STEAM BOILERS," upon the condition (amongst others)
that I, the said Edward Duclos de Boussois, by an instrument in
writing under my hand and seal, should particularly describe and ascer-
tain 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 Edward Duclos de Boussois, do
hereby declare the nature of the said Invention, and in what manner
the same is to be performed, to be particularly described and ascer-
tained in and by the following statement thereof (that is to say):
Heretofore, amongst other matters, muriatic acid has been applied in
some cases to the purpose of preventing incrustation in boilers, and in
other cases muriate of barytes has been used for like purposes. Now,
the object of my Invention is to combine the use of muriatic acid and

page_text: muriate of barytes at one and the same time, by which means more
beneficial results are obtained.
Having thus stated the nature of the Invention, I will proceed to
describe the means pursued by me.
I ascertain by chemical analysis the composition of the water to be
supplied to the boilers; I prepare the solution containing the muriate
of barytes and muriatic acid accordingly, and in such proportion so as
to render and convert the salts of magnesia, lime, or other basis, which
would deposit by ebulition, into solubles and neuter muriates; per
instance, when the water of alimentation is saturated with sulphate and
carbonate of lime, according to circumstances, it may contain two in
thousand parts of sulphate of lime, and one or more or less of carbonate
of lime in thousand part; the quantity of this last salt will vary much,
as it is held in solution in water only by the action of the carbonic acid
contained in spring or mineral waters. In such case, in a wooden
barrel or other suitable vessel, I prepare a chemical solution containing
the following-water, four hundred and fifty pounds; crystallized
inuriate of barytes, hundred and twenty-five pounds; muriatic acid of
1.20 specific gravity, twenty-five pounds. When the muriate of barytes
is dissolved, it is fit for use; per instance, when the water to be
supplied to the boilers can be conveniently placed in tanks or reservoirs,
the vessel containing the chemical composition is disposed in such
manner as to permit the delivery of fifteen pounds, or about, of the
above solution to the water operated upon, and this for hundred gallons
or thousand pounds of water; the supply is regulated by means of taps
or cocks, or such other arrangements as will best ensure its regularity,
proper means being taken to have the whole well mixed: a double
decomposition takes place, muriate of lime is formed and sulphate of
barytes; the first remains in solution, the second precipitates; to neu-
tralise any excess of free acid which might be left I place fragments
of broken limestone in a cane basket, or of other suitable wood.
near or upon the orifice of the eduction pipe or channel through which
the water is brought to the feeding pumps of the boiler, thus forming
muriate of lime; the solution prepared according to the chemical
equivalents of the salts held in solution in the water to be operated

page_text: upon may be applied in any tender, reservoir, or tanks of any loco-
motive, marine, or land boiler in such quantity as to form the muriate
of lime and sulphate of barytes, with the addition of broken limestone,
as above described.
I claim the use of muriatic acid and muriate of barytes combined,
the use of carbonate of lime, as above described.
In witness whereof, I, the said Edouard Duclos de Boussois, have
hereunto set my hand and seal, the Twenty-sixth day of
November, in the year of our Lord One thousand eight hundred
and fifty-three.
E. DUCLOS DE BOUSSOIS. (L.S.)
E. SEIGNETTE, d Paris, Witness.