AN IMPROVED PROCESS OF TREATING CALCAREOUS BRICKS
Year: 1881

page_text: LETTERS PATENT to Friedrich Hermann Felix Engel, Civil Engineer and
Patent Agent, of the City of Hamburg, Germany, for an Invention of
"AN IMPROVED PROCESS OF TREATING CALCAREOUS BRICKS." A communi-
cation from Joachim August Adolph Renck, of Wickendorf, in the Grand-
Dukedom of Micklenburg, in the German Empire.
PROVISIONAL SPECIFICATION left by the said Friedrich Hermann Felix
Engel at the Office of the Commissioners of Patents on the 28th
September 1881.
FRIEDRICH HERMANN FELIX ENGEL, Civil Engineer and Patent Agent, in the
City of Hamburg, Germany. "AN IMPROVED PROCESS OF TREATING CALCAREOUS
BRICKS." A communication from Joachim August Adolph Renck, of Wickendorf,
in the Grand-Dukedom of Micklenburg, in the German Empire.
In a great number of brick kilns there is present the disadvantage that chalk
or lime in greater or less quantities is or are embodied in or mixed up with the
clay, so that the bricks after being burned get cracked or break up by the slacking
of the lime.
In many cases such impurities cannot be sufficiently removed from the clay by
washing, sifting, grinding, or other mechanical means employed for that purpose,
and bricks made of such material will sooner or later be destroyed by absorbing
the moisture from the atmosphere whereby will be caused a slacking of the lime
contained therein.
The damaging influence of such impurities and reaction on the bricks can by
this Invention be fully neutralized no matter whether the calcareous parts are
mixed with the clay in a pulverized or in its original state.
According to this improved process the bricks are brought direct from the oven
whilst still warm into pits or other reservoirs, which latter are then filled with
water so that the whole quantity of bricks is put under water. The lime combines

page_text: with the water directly but under quite different circumstances than by slacking
the former commonly, as the surplus of water kills the lime without causing the
blistering and expanding effect that is produced when lime is slacked under
addition of small quantities of moisture. A voilent generation of gas does not
arise, and consequently the damaging influnce upon the bricks caused during the 5
gradual slacking of the lime is fully prevented. After an hour or some longer
time, and as soon as no more bubbles arise to the surface of the water level, the
bricks can be removed from the pits or other reservoirs employed, and such bricks
can then be used for building or other purposes without any risk from the
embodied calcareous impurities as the lime is killed and cannot further exert any 1
expanding effect.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Friedrich Hermann Felix Engel in the Great Seal Patent
Office on the 28th March 1882.
FRIEDRICH HERMANN FELIX ENGEL, Civil Engineer and Patent Agent, in the
City of Hamburg, Germany. "AN IMPROVED PROCESS OF TREATING CALCAREOUS
BRICKS." A communication from Joachin August Adolph Renck, of Wickendorf,
in the Grand Dukedom of Mecklenburgh, in the German Empire.
In a great number of brick-kilns there is present the disadvantage that chalk
or lime in greater or lesser quantities is or are embodied in or mixed up with the
clay, so that the bricks after being burned get cracked or break up by the slacking
of the lime.
In many cases such impurities can not be sufficiently removed from the clay
by washing, sifting, grinding, or other mechanical means employed for that
purposes and bricks made of such material will sooner or later be damaged or
destroyed by absorbing the moisture from the atmosphero whereby will be caused
a slacking of the lime contained therein.
The damaging influence of such impurities and reaction on the bricks can by
this Invention be fully neutralized no matter whether tho calcarous parts aro
mixed with the clay in a pulverized or in its original state.
According to this improved process the bricks are brought direct from the oven
whilst still warm into pits or other reservoirs, which latter are then filled with
water so that the whole quantity of bricks is put under water. The limo combines
with the water directly but under quite different circumstances than by slacking
the former commonly, as the surplus of water kills the lime without causing the
blistering and expanding effect that is produced when lime is slacked under
addition of small quantities of moisture. A violent generation of gas does not
arise, and consequently the damaging influence upon the bricks caused during the
gradual slacking of the lime is fully prevented. After an hour or some longer
time, and as soon as no more bubbles arise to the surface of the water level, the
bricks can be removed from the pits or other reservoirs employed and allowed to
dry sufficiently, and such bricks can then be used for building or other purposes
without any risk from the embodied calcareous impurities as the lime is killed and
cannot further exact any expanding effect.
Having now described the nature and particulars of the said Invention and the
manner in which the same may be readily carried into practical effect, I claim,-
The improved process of heating calcareous bricks as and for the purpose herein
set forth.
In witness whereof, I, the said Friedrich Hermann Felix Engel, have hereunto
set my hand an seal, this Twenty fifth day of March, in the year of our