Improvements in the Manufacture of Portland or similar Cement.
Year: 1888

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Portland or similar Cement.
We, JAMES ROBERTON, of 20 Armadale Street, Glasgow, in the County of Lanark,
North Britain, Builder, and JOHN ALEXANDER PATRICK, of 1 Broompark Terrace,
Glasgow, aforesaid, Commission Agent, do hereby declare the nature of this Invention
to be as follows, that is to say:-
This Invention has for its object the making of Portland or similar cement in an
improved manner and with inexpensive materials.
In carrying out the Invention we take limestone and break or crush it by means of
a stonebreaker or other suitable machine, down to about the size of walnuts. We
also take poor shale or what is known as "blaes" and we combine the limestone
and blaes in suitable proportions, say about three parts by weight of limestone to one
of blaes. The limestone and blaes are ground together in a pan mill having edge
runners and made with a perforated bottom. A regulated supply of water is added
to the materials in the pan inill so as with them to form a slurry which passes through
the pan bottom. The slurry is next elevated or otherwise conveyed to a pair of
horizontal millstones by which it is ground extremely fine. The material is finally
dried and kilned in the ordinary way.
Instead of adding water in the pan mill, the materials may be ground dry in the
pan mill and have water added to them when passing through the millstones.
Dated this Twenty-first day of February 1888.
EDMUND HUNT,
Applicants' Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Portland or similar Cement.
JAMES ROBERTON, Kiln Builder, 20 Armadale Street Glasgow and JOHN ALEXANDER
PATRICK, Brick Maker, sometime residing at number One Broompark Terrace
Dennistoun Glasgow now at Number Six Brooklands Avenue, Uddingston 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:
This Invention has for its object the making of Portland or similar Cement in an
improved manner and with inexpensive materials.
In carrying out the Invention we take limestone and break or crush it by means of
a stonebreaker or other suitable machine, down to about the size of walnuts. We
also take poor shale or what is known as "blaes" and we combine the limestone and
blaes in suitable proportions, say about three parts of weight of limestone to one of
blaes. The limestone and blaes are ground together in a pan mill having edge
runners and made with a perforated bottom. A regulated supply of water is added
to the materials in the pan mill so as with them to form a slurry which passes through
the pan bottom. The slurry is next elevated or otherwise conveyed to a pair of
horizontal millstones by which it is ground extremely fine. The material is finally
dried and kilned in the ordinary way. Instead of adding water in the pan mill, the
materials may be ground dry in the pan mill and have water added to them when
passing through the millstones.
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. An Improved system of arrangements or combinations for the production of
Portland Cement substantially as herein before described.
2. The combination of limestone, poor shale or "blaes" and water passed through
a pan mill for the production of a slurry for the manufacture of Portland Cement
substantially as herein before described.
3. The combination of limestone and poor shale or "blaes" passed through a
pan mill in a dry state and thereafter adding water to the powder so produced
whilst being ground fine by millstones substantially as hereinbefore described.
Dated this Twentieth day of November 1888.
JOHN HUGG,
Applicants' Agent.