Improvements in the Manufacture of Plaster, Cement, Mortar, and the like from Chalk.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Plaster, Cement, Mortar, and
the like from Chalk.
I, JOHN THOMLINSON, of 66, Fortess Road, Kentish Town, London, Gentleman
do hereby declare the nature of this invention to be as follows:-
The invention which forms the subject of my present application for Letters
Patent, consists of a novel method of preparing plaster, cement, mortar or similar
compounds with chalk in the raw or uncalcined state, whereby a great economy in
the cost of production is attained without any sacrifice of quality for the purposes
to which the preparation is to be applied, and in certain cases, the resultant plaster
obtainable by my present method is even better suited for plasterer's use than
ordinary plaster prepared with calcined chalk or lime in the usual manner.
In carrying my invention into operation, I prepare ordinary chalk by grinding it
to the requisite fineness. If the percentage of moisture in the material is too great
to permit of its being satisfactorily ground, the chalk may be somewhat dried in
any convenient manner.
To the finely ground material there is added an admixture of glue and of certain
salts, preferably alum or the sulphates of the alkalies or of certain metals.
In addition to these salts, the salts of various other elements or compounds thereof,
such as borax might be used, and I do not limit myself to those above specified.
The mass is then compounded with sand in requisite proportious as best suited for
the purpose for which it is intended. The proportions of the different ingredients
are approximately as follows :-
Ground chalk
Binding materials glue and salts
Cand
-
112 parts.
6 to 12 parts.
11rta
These proportions may vary according to the purpose for which the article
is prepared and the wear and strain to which it is likely to be exposed 1 also
reserve the right to vary the proportions as further experiment may demonstrate to
he advisable.
The precise method of compounding the various ingredients is capable of
considerable variation according to the precise purpose in view and I do not limit
myself to the method indicated above by way of example.
Dated this 5th day of September.
W. P. THOMPSON & Co.,
31, High Holborn, Loudon, W.C., Patent Agents for the Applicant.

page_text: Improvements in the Manufacture of Plaster, Cement, Mortar, and
the like from Chalk.
I, JOHN THOMLINSON, of 66, Fortess Road, Kentish Town, London, Gentleman,
do hereby declare the nature of this invention and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement :-
The invention which forms the subject of my present application for Letters
Patent, consists of a novel method of preparing plaster, cement, mortar or similar
compounds with chalk in the raw or uncalcined state, whereby a great economy in
the cost of production is attained without any sacrifice of quality for the purposes
to which the preparation is to be applied, and in certain cases, the resultant plaster
obtainable by my present method is even better suited for plasterer's use than
The
ordinary plaster prepared with calcined chalk or lime in the usual manner.
plaster of my invention is not liable to effloresce.
In carrying my invention into operation, I prepare ordinary chalk by grinding it
to the requisite fineness. If the percentage of moisture in the material is too great
to permit of its being satisfactorily ground, the chalk may be somewhat dried in
any convenient manner.
To the finely ground material there is added an admixture of glue and of certain
salts, preferably alum or the sulphates of the alkalies and alkaline earths, such as
gypsum or of certain metals. In addition to these salts, the salts of various other
elements or compounds thereof, such as borax might be used, and I do not limit
myself to those above specified. The mass is then compounded with sand in
requisite proportions as best suited for the purpose for which it is intended.
The proportions of the different ingredients are usually approximately as
follows:-
Sand or the like
112 parts.
When it is desirable to colour the plaster I add the requisite quantity of pigment
to the above proportions or substitute a coloured material such as oxide of iron for
a portion of the sand in the mixture.
The proportions may vary according to the purpose for which the article is
prepared and the wear and strain to which it is likely to be exposed.
The precise method of compounding the various ingredients is capable of
considerable variation according to the precise purpose in view and I do not limit
myself to the method indicated above by way of example.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In the manufacture of plaster, cement, mortar and the like the use of chalk in
the raw or uncalcined state in place of lime.
2. The improved compound for plaster, cement, mortar and the like consisting

page_text: essentially of uncalcined chalk and sand or the like together with a small percentage
of binding material and with or without salts of the alkalies, alkaline earths or
metals, and pigments or colouring materials substantially as described.
Dated this 5th day of June 1896.
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.