IMPROVEMENTS IN ARTIFICIAL STONE
Year: 1887

page_text: Date of Application, 29th Mar., 1887
Complete Left, 9th Jan., 1888
Complete Accepted, 10th Feb., 1888
I, Dr. LUDWIG PREUSSNER of Maassenstrasse Berlin in the German Empire,
Chemist do hereby declare the nature of said invention for "IMPROVEMENTS IN
ARTIFICIAL STONE to be as follows:-
This invention has reference to a process by which smooth and bright marble like
or enamel like objects may be produced and it consists in mixing in a suitable vessel
burnt magnesia and concentrated muriatic acid together, in a proportion to produce a
fluid paste, to which end, and according to the contents of the magnesia in carbonic
acid, from 1000 to 1500 grammes, or from 1000 to 1250 cubic centimetres of the
acid to 1500 grammes of the magnesia would be required. Hereupon the mixture
becomes highly heated with considerable evolution of carbonic acid and chloric gas.
It is then well stirred up and when the evolution of gas is quite finished a suitable
mineral powder is added for the purpose of imparting greater consistency and when
necessary as a vehicle for colouring. If by this means the paste should become too
thick it may be, thinned by the addition of a small quantity of water but this course
should be avoided as much as possible. The whole composition is then poured through
a sieve and passed into suitable hard india rubber moulds in which it crystallises and
hardens.
Should it be required to produce objects in a plurality of colours, the moulds
therefor, previous to the composition being passed into them, are decorated in a corre-
sponding manner, dry colouring powder being used for this purpose. The substance
upon setting, becomes intimately and durably combined with the colour.
In this way objects may be produced as desired which are in one or several colours,
with reliefs or other decorations, smooth and bright.
EMIL
CAPITAINE,
89, Chancery Lane, London, W.C.,
Agent for the Applicant.

page_text: I, Dr. LUDWIG PREUSSNER of Maassenstrasse, Berlin in the German Empire,
Chemist, do hereby declare the nature of said invention for "IMPROVEMENTS IN
ARTIFICIAL STONE and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This invention has reference to a process by which smooth and bright marble like
or enamel like objects may be produced, and it consists in mixing in a suitable vessel
burnt magnesia and concentrated muriatic acid together, in a proportion to produce a
fluid paste, to which end, and according to the contents of the magnesia in carbonic
acid, from 1000 to 1500 grammes, or from 1000 to 1250 cubic centimetres of the acid
to 1500 grammes of the magnesia would be required. This fluid paste is poured into
suitable hard india rubber moulds in which it hardens.
Artificial stone has been made by mixing materials or earths with burnt magnesia
and then adding watery hydrochlorate in uncertain proportion so as to produce as
dry a composition as practicable. This is pressed in moulds. It is not however
commercially useful to any extent as it acquires but a low degree of hardness and
cracks by subsequent absorption of water and carbonic acid. These disadvantages are
not present in the artificial stone of this invention owing to the peculiar mixing
together of the individual materials by which a substance is produced through other
different chemical combinations and consequently possessing other chemical
properties.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed, I declare that what I claim is:
The process for producing artificial stone marble like or enamel like objects smooth
and bright, by mixing burnt magnesia with concentrated muriatic acid and pouring
this mixture into hard india rubber moulds.
Dated this 9th day of Januar 1000
EMIL
CAPITAINE,
89, Chancery Lane, London, W.C.,
Agent for the Applicant.