Year: 1885

page_text: :
I ALFRED GEORGE BROOKES of the firm of Wm Brookes & Son of 55 & 56
Chancery Lane in the County of Middlesex Fellow of the Institute of Patent
Agents do hereby declare the nature of this invention to be as follows :—
The invention relates to improvements in manufacturing artificial stones ;. and
the objects of these improvements are to produce cast stones without cracks and to
give such cast stones the exterior of marble or granite.
To carry the invention into practice very fine cement is mixed with barytes. By
adding-suitable mineral colours almost any tinge desired for such prepared cement,
except a clear white one, may be obtained
For producing imitation marble, or grauite a convenient number of pastes of
different colours are made by mixing the prepared and coloured cement with water,
then dividing such pastes in pieces of small size, when granite is to be manufactured,
and in pieces of larger size for imitating marble. Over these humid cement lumps
is spread dry cement of different colour and the whole mass is then well kneaded
taking care to so maintain the coherent nature of the single. lumps. The dry
cement naturally adheres to the humid lumps and imbeds them. When grauite is
to be imitated the application of the dry cement may be omitted by mixing the
lumps of different colours and pressing the mixed mass into moulds.
After a few days, when the stones are somewhat hardened, they are shaped by
means of suitable shaping tools for which purpose even ordinary cabinet-maker's
planes of suitable form may be made to serve.
As soon as the stones are sufficiently hard, they are ground by grindstones, at
first by coarser ones and afterwards by finer ones; as grinding-liquid a mixture of
calcareous lye and potash-water-glass is employed, or other suitable liquid adapted
to facilitate grinding. The calcareous lye is obtained by dissolving slaked fat lime
in water; this solution is left untouched until the calcic hydrate is settled,
whereafter the calcareous lye, which forms a clear liquid above the hydrate,
is drawn off.
Then the stones are polished at first by means of the described mixture of
calcareous lye and water-glass and two to four days later by means of tin-putty,
sublimated sulphur and alum or equivalent polishing matter.

page_text: ☐
Improvements in Manufacturing Artificial Stones or Marbles.
I ALFRED GEORGE BROOKES of the firm of Wm' Brookes & Son of 55 & 56
Chancery Lane in the County of Middlesex Fellow of the Institute of Patent
Agents (a communication from abroad by Rudolph Alexander Meyn and Johann
Friedrich Otto Armack, Merchants of Hamburg, Germany) do hereby declare the
nature of this invention for IMPROVEMENTS IN MANUFACTURING ARTIFICIAL STONES
OR MARBLES and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :—
13
÷
The invention relates to improvements in manufacturing artificial stones; and
the objects of these improvements are to produce cast stones without cracks and to
give such cast stones the exterior of marble or granite.
To carry the invention into practice very fine hydraulic cement is mixed with
barytes in the proportion of about one part cement to one to two parts of barytes.
By adding suitable mineral. colours almost any tinge desired for such prepared
cement, except a clear white one, may be obtained.
For producing imitation marble or granite a convenient number of pastes of
different colours are made by mixing the prepared and coloured cement with water,
then dividing such pastes in pieces of small size, when granite is to be manufactured,
and in pieces of larger size for imitating marble. Over these humid cement lumps
is spread dry cement of different colour and the whole mass is then well kneaded
taking care to maintain the coherent nature of the single lumps. The dry cement
naturally adheres to the humid lumps and imbeds them. When granite is to be
imitated the application of the dry cement may be omitted by mixing the lumps of
different colours and pressing the mixed mass into moulds.
After a few days, when the stones are somewhat hardened, they are shaped by
means of suitable shaping tools for which purpose even ordinary cabinet-maker's
planes of suitable form may be made to serve.
As soon as the stones are sufficiently hard, they are ground by grindstones, at
first by coarser ones and afterwards by finer ones; as grinding-liquid a mixture of
calcareous lye and potash-water-glass is employed or other suitable liquid adapted
to facilitate grinding.
-
I prepare the mixture of calcareous lye and potash-water-glass, which is found
to be the best suiting for the purposes, by dissolving one part of slacked fat lime in
three to four parts of water; this solution is left untouched until the calcic hydrate
is settled, whereafter the calcareous lye, which forms a clear liquid above the
bydrate, is drawn off" and mixed with potash-water-glass of 40° in the proportions
of about ten parts calcareous lye with one part of water-glass.
•
.
Then the stones are polished at first by means of the described mixture of
calcareous lye and water-glass and two, to four days later by means of tin-putty,
sublimated sulphur and alum or equivalent polishing matter.
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:
1. The process of producing artificial stones of light colour and without cracks

page_text: 2. In producing artificial stones imitating marble or granite the combination of
mixing humid cement lumps with dry cement powder of different colour or with
other cement lumps of differing colour, kneading the cement lumps together with
the dry cement respectively the lumps of differing colour by maintaining the
coherent nature of the single lumps and compressing the whole mass, substantially
as described.
3. The process of finishing artificial stones produced of hydraulic cement by
grinding the same under application of a mixture of calcareous lye and potash-
water-glass, and polishing the same at first with the above mixture and afterwards
with tin-putty, sublimated sulphur and alum-water, substantially as described.