AN IMPROVED APPARATUS FOR PREVENTING OR DESTROYING INCRUSTATIONS IN STEAM BOILERS
Year: 1860

page_text: LETTERS PATENT to Laurent Marie Boulard, of 39, Rue de l'Echiquiér,
Paris, in the Empire of France, Gentleman, for the Invention of "AN
IMPROVED APPARATUS FOR PREVENTING OR DESTROYING INCRUSTATIONS IN
STEAM BOILERS."
Sealed the 4th October 1860, and dated the 14th April 1860.
PROVISIONAL SPECIFICATION left by the said Laurent Marie Boulard
at the Office of the Commissioners of Patents, with his Petition, on
the 14th April 1860.
I, LAURENT MARIE BOULARD, of 39, Rue de FEchiquier, Paris, in the
Empire of France, Gentleman, do hereby declare the nature of the said
Invention for "AN IMPROVED APPARATUS FOR PREVENTING OR DESTROYING
INCRUSTATIONS IN STEAM BOILERS," to be as follows:-
My Invention consists in the substitution of a mechanical arrangement, as
below described, to the chemical reagents at present in general use, for the
prevention of calcareous deposits in steam boilers, or their destruction. when
formed. This arrangement is composed of a case or bag of pierced sheet
metal, metallic gauze, or even non-metallic tissue, corresponding in shape with
the boiler in which it is enclosed, and forming as it were an open-worked
lining, kept at a slight distance from the inner surfaces by means of brackets.
If so required, this lining, the meshes or perforations of which should be finer

page_text: at the bottom than at the top, may be made in several sections, which are
passed separately into the boiler by the man-hole, and afterwards connected in
any suitable way. It has been ascertained that this arrangement has the
property not only of preventing deposits on the inner surfaces of the boilers to
which it is applied, but also of removing such deposits from boilers already
fouled. In the one case the calcareous matters precipitate in the open lining,
by which they are entirely isolated, and from which they may easily be
removed from time to time. In the other the incrustations already formed
detach spontaneously from the surfaces of the boilers, and falling to the bottom
may be cleared away without further trouble.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Laurent Marie Boulard in the Great Seal Patent Office
on the 9th October 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, LAURENT
MARIE BOULARD, of 39, Rue de l'Echiquier, Paris, in the Empire of France,
Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourteenth day of April, in the year of our Lord
One thousand eight hundred and sixty, in the twenty-third year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
Laurent Marie Boulard, Her special licence that I, the said Laurent Marie
Boulard, my executors, administrators, and assigns, or such others as I, the
said Laurent Marie Boulard, my executors, administrators, and assigns,
should at any time agree with, and on 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 APPARATUS FOR PREVENTING OR DESTROYING INCRUSTATIONS IN
STEAM BOILERS," upon the condition (amongst others) that I, the said
Laurent Marie Boulard, my executors 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 im-
mediately after the date of the said Letters Patent.

page_text: NOW KNOW YE, that I, the said Laurent Marie Boulard, do hereby
declare the nature of my 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):—
My Invention consists in the substitution of a mechanical arrangement, as
below described, to the chemical reagents at present in general use for the
prevention of calcareous deposits in steam boilers, or their destruction when
formed. This arrangement is composed of a case or bag of pierced sheet
metal, metallic gauze, or even non-metallic tissue, corresponding in shape with
the boiler in which it is enclosed, and forming as it were an open-worked
lining, kept at a slight distance from the inner surfaces by means of brackets.
If so required, this lining, the meshes or perforations of which should be finer
at the bottom than at the top, may be made in several sections, which are
passed separately into the boiler by the man-hole, and afterwards connected in
any suitable way. In many cases the metallic or other tissue may be replaced
by a simple recipient in sheet metal, or even non-metallic material without
perforations inserted in the boiler, and secured by brackets, as above. In this
case, the apparatus, instead of being completely tubular, should be of a gutter
form, open at the top, the ends being either left open or closed with pierced
metal or gauze. Or again, the same results may be obtained by the insertion
in the boiler of any required number of wire gauze or other perforated shelves
superposed at equal distances, and so arranged as to be easily withdrawn from
time to time for the removal of the calcareous matters deposited.
It will be understood from the above examples that the same principle may
be applied to the protection of steam generators of every kind, the form of the
apparatus being varied according to the inner conformation of the boiler or
generator to which it is adapted.
It has been ascertained that this apparatus in any of the forms above
described, has the property, not only of preventing deposits on the inner
surfaces of the boilers to which it is applied, but also of removing such
deposits from boilers already fouled. In the one case the calcareous matters
precipitate in the open lining, by which they are entirely isolated, and from
which they may easily be removed from time to time. In the other, the
incrustations already formed detach spontaneously from the surfaces of the
boiler, and falling to the bottom may be cleared away without further trouble.
Having thus described the nature of my said Invention, and the manner in
which it is or may be carried into effect, I would have it understood that I do
not confine myself to the precise details above laid down, as these may be

page_text: more or less modified according to the intended application of the apparatus,
without deviating from the principles or characteristic features of the Inven-
tion; but what I claim is, the substitution of a mechanical arrangement,
substantially as above described, to the chemical reagents hitherto generally
employed for the prevention or destruction of calcareous deposits or in-
crustations on the inner surfaces of steam boilers.
In witness whereof, I, the said Laurent Marie Boulard, have hereto
set my hand and seal, this Eighth day of October, in the year of our
Lord One thousand eight hundred and sixty.
L. M. BOULARD. (L.S.)