Year: 1887

page_text: Date of Application, 22nd Oct., 1887
Complète Left, 17th May, 1888
Complete Accepted, 22nd June, 1888
We GEORGE JAMES SNELUS of Workington in the County of Cumberland
Metallurgist, WILLIAM WHAMOND of Jarrow in the County of Durham Doctor of
Medicine and THOMAS GIBB of Jarrow aforesaid Manufacturing Chemist do hereby
declare the nature of this invention to be as follows:-
:-
This Invention has for its object to manufacture hydraulic cements of reliable
quality and in an economical manner.
With this object we employ a mixture of blast furnace slag and quick lime the blast
furnace slag having been granulated by being whilst in a molten state brought into
contact with water. Slag so prepared retains a large quantity of water and we remove
the greater part but not the whole of this water which removal we effect preferably
by mechanical means such as by a centrifugal machine or hydro-extractor.
We mix the slag thus treated with the quicklime in such proportions that the
mixture shall not contain more lime (Ca O) than fifty two per cent. of the weight of
the mixture. If for instance such proportions of slag and slaked lime be used that
the mixture contains sixty per cent. of lime or more: hydraulic cement of the best
quality is not produced similar in hydraulicity strength and other physical character-
istics to Portland cement and we therefore do not use a proportion of lime such that
there is more than fifty two per cent. of lime in the mixture.
We complete the manufacture of the Cement by reducing the mixture of slag and
lime to a very fine powder by any suitable pulverizing apparatus.
Dated this 22nd day of October 1887
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, W.C.,
Agents.

page_text: -
An Improved Manufacture of Cements.
We GEORGE JAMES SNELUS of Workington in the County of Cumberland
Metallurgist WILLIAM WHAMOND of Jarrow in the County of Durham Doctor of
Medicine and THOMAS GIBB of Jarrow aforesaid Manufacturing Chemist 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 to manufacture Hydraulic Cements of reliable
quality and in an economical manner.
With this object we employ a mixture of blast furnace slag and quick lime the
blast furnace slag having been granulated by being whilst in a molten state brought
into contact with water. Slag so prepared retains a large quantity of water and we
remove the greater part but not the whole of this water which removal we effect
preferably by mechanical means such as by a centrifugal machine or hydro-
extractor.
We mix the slag thus treated with the quicklime in such proportions that the
mixture shall not contain more lime (Ca O) than 52% of the weight of the mixture.
If for instance such proportions of slag and lime be used that the mixture contains
60% of lime or more, hydraulic Cement of the best quality is not produced similar in
hydraulicity strength and other physical characteristics to Portland Cement and we
therefore do not use a proportion of lime such that there is more than 52 % of lime
in the mixture.
We complete the manufacture of the Cement by reducing the mixture of slag and
lime to a very fine powder by any suitable pulverizing apparatus.
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.
1st. The manufacture of Cement of quick lime in admixture with blast furnace
slag granulated by being brought whilst molten into contact with water and from
which the greater part but not the whole of the water has been removed the propor-
tions of lime and slag being such that 100 parts of the cement produced shall not
contain more than 52 parts of lime.
2nd. As a new article of manufacture a cement manufactured as hereinbefore
described and claimed.