AN IMPROVED MODE OF ACCELERATING THE INDURATION OF CERTAIN DESCRIPTIONS OF CONCRETE OR ARTIFICIAL STONE
Year: 1867

page_text: ETTERS PATENT to Marc Antoine François Mennons, of the Firm of
Mennons and Telescheff, Home and Foreign Patent Agents, of No. 8,
Southampton Buildings, in the County of Middlesex, and 53, Rue de
la Chaussée d'Antin, Paris, in the Empire of France, for the Invention
of "AN IMPROVED MODE OF ACCELERATING THE INDURATION OF CERTAIN
DESCRIPTIONS OF CONCRETE OR ARTIFICIAL STONE."-A communication from
Johann Georg Wilhelm Picker, residing at Braunschweig, in the Duchy
of Brunswick-Wolfenbuttel.
Sealed the 23rd June 1868, and dated the 31st December 1807.
PROVISIONAL SPECIFICATION left by the said Marc Antoine François
Mennons at the Office of the Commissioners of Patents, with his
Petition, on the 31st December 1867.
I, MARC ANTOINE FRANÇOIS MENNONS, of the Firm of Mennons and
Telescheff, Home and Foreign Patent Agents, of No. 8, Southampton
Buildings, in the County of Middlesex, and 53, Rue de la Chaussée d'Antin,
Paris, in the Empire of France, do hereby declare the nature of the said
Invention for "AN IMPROVED MODE OF ACCELERATING THE INDURATION OF
CERTAIN DESCRIPTIONS OF CONCRETE OR ARTIFICIAL STONE" (a communication),
to be as follows:-
This Invention consists in the application of carbonic acid gas as a means
of accelerating the induration of concrete or artificial stone composed of lime
and sand or other silicious Diatters. To this end the concrete mass being
sufficiently dried to admit of manipulation is placed in a closed chamber of
Price 8d.

page_text: suitable form and dimensions, and is exposed to the action of the carbonic
acid gas generated by any of the known processes in a separate apparatus.
By the higher specific gravity of the carbonic acid the atmospheric air con-
tained in the stony compound is expelled and escapes by discharge cocks
mounted in the upper part of the chamber, and the operation is continued
until the absorption of gas ceases, which point may be readily determined by
a pressure gauge or other test apparatus. As a general rule half an hour
suffices for the saturating process above described, but the time occupied is
necessarily variable according to the nature and degree of siccity of the
materials under treatment.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Marc Antoine François Mennons in the Great Seal Patent
Office on the 29th June 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MARC
ANTOINE FRANÇOIS MENNONS, of the Firm of Mennous and Telescheff, Home
and Foreign Patent Agents, of No. 8, Southampton Buildings, in the County
of Middlesex, and 53, Rue de la Chaussée d'Antin, Paris, in the Empire of
France, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirty-first day of December, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirty-first year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Marc Antoine François Mennons, Her special licence that I, the said
Marc Antoine François Mennons, my executors, administrators, and assigns,
or such others as 1, the said Marc Antoine François Mennons, my executors,
administrators, and assigns, should at any time agree with, and 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 MODE OF ACCELERATING THE
INDURATION OF CERTAIN DESCRIPTIONS OF CONCRETE OR ARTIFICIAL STONE," a
communication from Johann Georg Wilhelm Picker, a person resident at
Braunschweig, in the Duchy of Brunswick-Wolfenbuttel, upon the condition
(amongst others) that I, the said Marc Antoine François Mennons, 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

page_text: the nature of the said Invention, and in what manner the same was to be per-
formed, 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 Marc Antoine François Mennons, 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:-
This Invention consists in the application of carbonic acid gas as a means
of accelerating the induration of concrete or artificial stone composed of lime
and sand or other siliceous matters. To this end the concrete mass being
sufficiently dried to admit of manipulation is placed in a closed chamber of
suitable form and dimensions, and is exposed to the action of the carbonic
acid gas generated by any of the known processes in a separate apparatus.
By the higher specific gravity of the carbonic acid the atmospheric air con-
tained in the stony compound is expelled and escapes by discharge cocks
mounted in the upper part of the chamber, and the operation is continued
until the absorption of gas ceases, which point may be readily determined by a
pressure gauge or other test apparatus. As a general rule half an hour
suffices for the saturating process above described, but the time occupied is
necessarily variable according to the nature and degree of siccity of the
materials under treatment.
Having thus described and ascertained the nature of the said Invention,
and the manner in which it may be carried into effect, I would have it under-
stood that I do not confine myself to any particular process or apparatus,
either for obtaining the carbonic acid or for applying the same to the stony
compound; but what I claim and desire to protect by Letters Patent is, the
application of carbonic acid gas, substantially as above set forth, for the
purpose of accelerating the induration of concrete or artificial stone composed
of lime and sand or other siliceous matters.
In witness whereof, I, the said Marc Antoine François Mennons, have
hereunto set my hand and seal, this Twenty-sixth day of June, in the
year of our Lord One thousand eight hundred and sixty-eight