A New or Improved Manufacture of Hydraulic Cement.
Year: 1897

page_text: Date of Application, 23rd July, 1897
Complete Specification Left, 25th Apr., 1898-Accepted, 18th June, 1898
PROVISIONAL SPECIFICATION.
A New or Improved Manufacture of Hydraulic Cement.
We, NICHOLAS TAYLOR ASHTON, of Market Place, St. Ives, Cornwall, Chemist,
and JAMES CROMPTON, of 5, Tregenna Terrace, St. Ives, Cornwall, Methodist
Minister, do hereby declare the nature of this invention to be as follows:-
-:
Our invention relates to a new or improved manufacture of hydraulic cement by
means of which certain advantages are obtained.
In carrying our invention into effect we take the four following materials,
that is to say, granite, serpentine, china clay and calciferous sand. These we
crush, grind or pound until they assume the form of fine powders. We then put
them together and turn them over until they are thoroughly mixed. Thereafter
we subject them to the influence of heat until they are sufficiently burned, after
which we crush, grind or pound the material into a sufficiently fine powder.
We desire it to be understood that we are not at present prepared to state
the best proportions in which to add the said materials, nor are we yet prepared to
state the best methods of grinding, mixing and burning the materials, or the
best temperature or temperatures at which the burning should take place. We
are at present experimenting for the purpose of determining the best method of
carrying our invention into effect: and it is our intention to make full disclosure
in due course, when we have ascertained, our invention.
A New or improved Manufacture of Hydraulic Cement.
We, NICHOLAS TAYLOR ASHTON, of Market Place, St. Ives, in the County of
Cornwall, Chemist, and JAMES CROMPTON, of 5, Tregenna Terrace,, St. Ives, in
the County of Cornwall, Methodist Minister, 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:-
Our invention relates to a new or improved manufacture of hydraulic cement by
means of which certain advantages are obtained.
In carrying our invention into effect we take the four following materials,

page_text: that is to say granite, serpentine, china clay and calciferous sand. These we
take in the following proportions by weight:-
Granite.
Serpentine
China Clay
Calciferous sand
about 20 parts.
1 part.
"
وو
10 parts.
"
100 parts.
These we crush and grind into the form of fine powders. We then intimately
mix them preferably in the form of slip or slurry and afterwards burn the mixture
at a white heat so as to form a clinker, after which we crush and grind the said
clinker to an impalpable powder which may be further sifted, if necessary and then
done up or put away for future use
When the calciferous sand employed contains too small a quantity, of lime, as
may happen, we' bring it up to the necessary quality by the addition of caustic
lime.
We have found by experiment that the serpentine may be omitted but as a
rule we prefer to employ it.
J
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
.
1. The new or improved manufacture of hydraulic cement substantially as set
forth.
2. The combination of granite, serpentine, china clay and calciferous sand sub-
stantially as and for the purpose set forth.
3. The combination of granite, china clay and calciferous sand substantially
as and for the purpose set forth.
Dated
THIS IS O1 April 100.
For the Applicants,
J. G. LORRAIN, M.I.E.E., M.I. Mech. E.,
Norfolk House, Victoria Embankment, London, W.C.,
Chartered Patent Agent.