IMPROVEMENTS IN THE MANUFACTURE OF ARTIFICIAL STONE
Year: 1883

page_text: LETTERS PATENT to Friedrich Hermann Felix Engel Civil Engineer and
"
Patent Agent in the city of Hamburg Germany for an Invention of
'IMPROVEMENTS IN THE MANUFACTURE OF ARTIFICIAL STONE" a com-
munication to me by Eduard Murjahn of Hamburg in the German Empire
PROVISIONAL SPECIFICATION left by the said Friedrich Hermann Felix
Engel at the Office of the Commissioners of Patents on the 21st May 1883.
FRIEDRICH HERMANN FELIX ENGEL Civil Engineer and Patent Agent in the
city of Hamburg Germany "IMPROVEMENTS IN THE MANUFACTURE OF ARTIFICIAL
STONE"
a communication to me by Eduard Murjahn of Hamburg in the German
Empire,
This invention has for its object the manufacture of artificial stone out of clay
and peat (turf) which stone can be made of different degrees of hardness. The
process of manufacture consists of mixing in a damp state clay and peat (which
latter must be pulverized) in certain proportional quantities and by forming out of
such mixture stones, blocks, ornaments, or other objects which after being dried to
a certain degree, are burned in kilns or otherwise like common bricks or pottery.
According to the proportion of peat included in the mixture the material produced,
varies in density, weight and hardness. One portion of peat and two portions of
clay produce a material that may be usefully employed in the construction of walls
for buildings
As the weight of this improved artificial stone is less than that of common bricks,
the foundation need not be so strong as required if the latter were used. Another
advantage of this improved manufacture is, that the admixture of peat secures a
thorough and uniform burning of the articles in consequence of which the degree
of hardness as well as the colour of objects made according to this process is very
uniform.

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 21st November 1883.
FRIEDRICH HERMANN FELIX ENGEL Civil Engineer and Patent Agent in the
City of Hamburg Germany "IMPROVEMENTS IN THE MANUFACTURE OF ARTIFICIAL
STONE" a communication to me by Eduard Murjahn of Hamburg in the German
Empire.
This Invention has for its object the manufacture of artificial stone out of clay
and peat which stone can be made of different degrees of hardness. The process of
manufacture consists of mixing in a damp state clay and peat (which latter must
be pulverized in certain proportional quantities) and by forming out of such
mixture stones, blocks, ornaments, or other objects, which after being dried to a
certain degree are burned in kilns or otherwise like common bricks or pottery.
According to the proportion of peat included in the mixture the material produced,
varies in density weight and hardness. One portion of peat and two portions of
clay produce a material that may be usefully employed in the construction of walls
for buildings. As the weight of this improved artificial stone is less than that of
common bricks the foundation need not be so strong as would be required if the
latter were used. Another advantage of this improved manufacture is that the
admixture of peat secures a thorough and uniform burning of the articles in
consequence of which the degree of hardness as well as the color of objects made
according to this process is very uniform.
In cases where it is of importance to produce a stone that is fire proof to a very
high degree the clay as well as the peat used must be carefully washed so that sandy
admixtures and other impurities are removed.
Having now described the nature and particulars of the said Invention I
claim
The improvements in the manufacture of artificial stone out of clay and peat as
and for the purposes substantially as herein specified.
In Witness whereof I the said Friedrich Hermann Felix Engel have hereunto
set my hand and seal this seventeenth day of November in the year of our Lord
one thousand eight hundred and eighty three.
F. H. F. ENGEL. (L.S.)
F. H. F. ENGEL. (L.S.)