AN IMPROVED PLASTIC OR FICTILE COMPOUND
Year: 1880

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company,
Patent Solicitors, at Frankfort on the Main, in the Empire of Germany, for an
Invention of "AN IMPROVED PLASTIC OR FICTILE COMPOUND." A communi-
cation from Bernhard von Schenk and Rudolf von Schenk, trading under the
Firm of "Gebrüder von Schenk," and resident at Heidelberg, in the Empire
of Germany.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 14th February 1880.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany. "AN IMPROVED PLASTIC
OR FICTILE COMPOUND." A communication from Bernhard von Schenk and Rudolf
von Schenk, trading under the Firm of "Gebrüder von Schenk," of Heidelberg,
in the Empire of Germany.
The Invention relates to an improved plastic or fictile compound to be used in
the same manner as ordinary gypsum for the manufacture of various articles.
In carrying the said Invention into practice I mix (gypsum) sulphate of lime
with pulverized coke, with or without addition of iron scale or hammer slag.
The whole is well mixed, and if necessary sifted through a fine sieve for obtaining
a more homologous powder than would otherwise be obtained. This powder when
required to be used is mixed with water, and then treated in the same manner as
gypsum
for manufacturing various objects.
The proportions I find advantageous are as follows:-

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frank Wirth in the Great Seal Patent Office on the 11th August
1880.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany. "AN IMPROVED PLASTIC OR
FICTILE COMPOUND." A communication from Bernhard von Schenk and Rudolf
von Schenk, trading under the Firm of "Gebrüder von Schenk," of Heidelberg,
in the Empire of Germany.
65
This Invention relates to an improved plastic or fictile compound which I term
tripolith," and which is intended to be used in the place of plaster of Paris. This
compound is especially applicable to the manufacture of plastic objects or articles,
and possesses the following great advantages over plaster of Paris, that is to say :-
My improved compound or tripolith becomes as hard as cement, and sets quicker
than plaster of Paris. It can be cast in any mould and will produce sharper and
lighter castings than plaster of Paris. Moreover the mass dries quicker and
possesses greater strength than plaster of Paris, and can be used for all plastic
purposes and stucco work. The said compound is no dearer than plaster of Paris,
but can be more easily worked than the latter; it does not freeze, and when once
soaked and coated with oil will resist any action or effect of the weather.
paint takes a firm hold of the mass which grows harder as it becomes older. It
can be often washed with soap and water, and its color is warmer than that of
plaster of Paris, which is of importance in drawing from models. My improved
compound or tripolith is composed of,-
Sulphate of lime
Powdered coal or coke
Iron shales or forge scales
-
9.55 kilogrammes.
-
-
1.00
do.
0-60
do.
Oil
These materials being finely powdered are thoroughly mixed, and then passed
through a hair sieve, in order that they may be all equally fine. Before the coke
is added it should be somewhat damped, so that on stirring the larger particles
sink to the bottom, otherwise the casting to be made will be spotty. The iron
shales may be left out of the mass if desired, but the product is then not so
strong.
This compound or mass when used is mixed with water, and manipulated in other
respects exactly in the same manner as plaster of Paris.
Having thus fully described the said Invention, and the manner of performing
the same, I wish it understood that I claim,―
A compound or mass consisting of sulphate of lime and coke or coal, either with
or without iron scales, as above set forth and for the purpose specified.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand
and seal, this Sixth day of August, in the year of our Lord One
thousand eight hundred and eighty.