Improvements in the Manufacture of Non-efflorescent White Cements from Calcined Sulphate of Lime.
Year: 1892

page_text: Date of Application, 22nd Oct., 1892
Complete Specification Left. 20th July, 1893-Accepted, 26th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Non-efflorescent White Cements
from Calcined Sulphate of Lime.
I, JOHN THOMLINSON, of Englethwaite, Carlisle, in the County of Cumberland,
Cement Manufacturer, do hereby declare the nature of this invention to be as
follows:-
In the manufacture of white cements from sulphate of lime, it is customary to use
various costly chemical salts such as tincal, borax &c., all such cements after
having been applied to walls and ceilings as plastering throw off a portion of these
added salts as an efflorescence which seriously damages painting and papering put
upon the plastered surfaces thus great and serious damage occurs to costly
decorations and eventually the paper and paint is thrown off in patches-now I
find that all the valuable properties of all the well known white cements now made
from sulphate of lime and these various added salts, can be secured. The serious
difficulty of efflorescence can be completely avoided and a very large portion of
the present great cost of production of these various cements as now made can be
saved.
According to my invention in place of the above named salts I make use of
various farinaceous grains; preferably I employ in admixture with the calcined
sulphate of lime the products of ground wheat in various forms. These matters I
find very efficacious-mainly I believe from their richness in soluble nitrogenous
matter. They may be added in quantities varying from 100 to 200 lbs. to the tou
of calcined sulphate of lime, according to the strength and variety of cement that
it may be desired to produce.
Dated this 20th der of Octaban 1802
JOHN THOMLINSON.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Non-efflorescent White Cements
from Calcined Sulphate of Lime.
1, JOHN THOMLINSON, of Englethwaite, Carlisle, in the County of Cumberland,
Cement Manufacturer, 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 :-
In the manufacture of white cements from sulphate of lime, it is customary to
use various costly chemical salts such as tincal, borax &c., all such cements after
having been applied to walls and ceilings as plastering throw off a portion of these
added salts as an efflorescence which seriously damages painting and papering put
upon the plastered surfaces thus great and serious damage occurs to costly
decorations and eventually the paper and paint is thrown off in patches-now I
find that all the valuable properties of all the well known white cements now made
from sulphate of lime and these various added salts can be secured, the serious
difficulty of efflorescence can be completely avoided and a very large portion of
the present great cost of production of these various cements as now made can
be saved.
According to my invention in place of the above named salts I make use of
various farinaceous grains; preferably, I employ in admixture with the calcined
sulphate of lime the products of ground wheat in various forms. These matters I
find very efficacious-mainly I believe from their richness in soluble nitrogenous

page_text: matter. They may be added in quantities varying from 100 to 200 lbs. to the ton
of calcined sulphate of lime, according to the strength and variety of cement that
it may be desired to produce and the quality of the gypsum used. A good useful
cement may be made with ground wheat and calcined sulphate of lime in the
proportions of one part of the former to 25 parts of the latter. These materials 1
cause to be ground separately to very fine powders and I then intimately mix the
two powders in the proportions above stated, or in such other proportions as may
be judged necessary, having regard to the fact that the larger the proportion of
farinaceous material, the slower will be the setting of the cement.
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 :-
Cement substantially as described consisting of calcined sulphate of lime and
farinaceous matter.
Dated this 10th day of July 1893
JOHN THOMLINSON.