Improvements in the Manufacture of Portland Cement.
Year: 1891

page_text: Date of Application, 3rd Mar., 1891
Complete Specification Left, 1st Dec., 1891-Accepted, 9th Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Portland Cement.
I GEORGE HENRY SKELSEY of High Street Hull in the County of York,
Cement Manufacturer, do hereby declare the nature of this invention to be as
follows:-
The
The object of my invention is to manufacture Portland cement from chalk which
hitherto has not been used for such purposes, as it has been found impossible to
prepare it for such use, by this means cement can be made at much less cost.
chalk referred to is to be found in large quantities in the neighbourhood of Hull, and
other places, and is so extremely hard, that up to the present time it has been
considered of no value for this purpose.
I employ the ordinary washmill in combination with an edge runner mill made
with specially constructed heavy runners; the chalk is weighed into the required
quantities before it is passed to the edge runner mill, where it is mixed with a
certain proportion of water, and ground into a thin paste of the required gravity,
and then flows or is passed to a washmill, in which it is mixed with a certain
proportion of clay, after which the manufacture is proceeded with in the ordinary
manner usually employed in cement manufacturing.
Dated this Twenty-seventh day of February 1891
JOHN E. WALSH,
Waterhouse Chambers, Crossley Street, Halifax,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Portland Cement.
I GEORGE HENRY SKELSEY, of High Street, Hull, in the County of York,
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 :-
The object of my invention is to manufacture Portland cement from chalk which
hitherto has not been used for such purposes, as it has been found impossible to
prepare it for such use, by this means cement can be made at much less cost.
The chalk referred to is to be found in large quantities in the neighbourhood of
Hull, and other places, and is so extremely hard, that, up to the present time it has
been considered of no value for this purpose. The chalk contains carbonic acid,
lime, magnesia, oxide of iron, alumina, soluble silica, insoluble silica, sulphur, soda
and potash.
I employ the ordinary wash-mill in combination with an edge runner mill, made
with specially constructed heavy runners; the chalk is weighed into the required
quantities before it is passed to the edge runner mill, where it is mixed with water, .
and ground into a thin paste of the required gravity, and then flows or is passed to
a wash-mill, in which it is mixed with the usual proportion of clay, after which the
manufacture is proceeded with in the ordinary manner usually employed in cement
manufacturing.

page_text: Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The manufacture of cement from hard chalk, substantially as shown and
described.
JOHN E. WALSH,
Crossley Street, Halifax, Agent for the Applicant.