Improvement in the Manufacture of Plaster for Walls, Ceilings and the like.
Year: 1897

page_text: . Date of Application, 15th Sept., 1897
Complete Specification Left, 7th June, 1898-Accepted, 13th Aug., 1898
PROVISIONAL SPECIFICATION.
Improvement in the Manufacture of Plaster for Walls, Ceilings and
the like.
I, JOHN ALLCOCK JONES, of 30, Albert Road, Middlesbrough-on-Tees, in the
County of York, Merchant and Manufacturer, do hereby declare the nature of
this invention to be as follows:
I take slag by preference grey slag a product resulting from the manufacture
of Cleveland pig iron from Cleveland ore and after such slag has by preference
been annealed though I do not confine myself to annealed slag, as raw slag
may be used, but with not so good a resulting quality-I use it alone or in com-
bination with sand, cement, other plasters, or with lime for the purpose of making
a plaster to be applied to walls ceilings and the like. The slag is crushed fine
to pass through say 2,500 holes to the square inch more or less without residuum
and the finer it is ground the better it will be especially for the finishing coat.
The rough or rendering coat can of course be somewhat coarser in grain. The
annealing which I prefer is one well known in the district and in regular use by
means of ovens into which the material is placed and heat applied, after which
the slag or material so placed is slowly allowed to cool. I do not confine myself
to that system alone so long as the main feature being in result a slag which is
made more dense and freer from the porosity which is characteristic of raw slag,
and which is also rendered tougher by the operation. When prepared it is mixed
with water and applied in the usual way, and it may be mixed if necessary with
cement, plaster of Paris or lime ingredients.
TARTA
Improvement in the Manufacture of Plaster for Walls, Ceilings and
the like.
•
I, JOHN ALLCOCK JONES, of 30, Albert Road, Middlesbrough-on-Tees, in the
County of York, Merchant and 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:—
I take slag, by preference grey slag a product resulting from the manufacture
of Cleveland pig iron from Cleveland ore, and after such slag has by preference
been annealed though I do not confine myself to annealed slag, as raw slag
may be used, but with not so good a resulting quality-I use it alone or in com-
bination with sand, cement, other plasters, or with lime for the purpose of making

page_text: a plaster to be applied to walls, ceilings, and the like. The slag is crushed fine
to pass through say 2,500 holes to the square inch more or less without residuum
and the finer it is ground, the better it will be, especially for the finishing coat.
The rough or rendering coat can of course be somewhat coarser in grain. The
annealing which I prefer is one well known in the district, and in regular use by
means of ovens into which the material is placed, and heat applied, after which
the slag or material so placed is slowly allowed to cool. I do not confine myself
to that system alone, so long as the main feature being in result a siag which is
made more dense and freer from the porosity which is characteristic of raw slag
and which is also rendered tougher by the operation. When prepared it is mixed
with water, and applied in the usual way, and it may be mixed if necessary with
cement, plaster of Paris, or lime ingredients.
•
In practically carrying out my invention I proceed as follows:-
For the making of a rendering coat, which is the coat next to the bricks, I take
one unit of Portland cement, two units of annealed slag, half a unit of slaked lime,
and half a unit of clean sand, and grind the mixture into a fine powder, to go
through say about 1,000 holes mesh to the square inch. Clearly the mixture can
be varied and can be ground coarser or finer, but the above will make substantially
.a good plaster. In its application the worker may if necessary add cow or other
hair, and Portland or other cement to the plaster to suit his particular work.
For ceiling or stoohing work, it will be necessary to add more slaked lime, or
lime putty to the foregoing rendering mixture, say one unit in place of half, and
in its application, cow or other hair may be added to cause it to bind.
For the finishing coat which is usually one-eighth to one-quarter of an inch
thick, I would use the same mixture as for the rendering coat, except that no
Portland cement would be used, but would grind it much finer, say 3,000 mesh to
the square inch in fact the finer it is ground the better it will be. I would
also add more lime. The mixture would be as follows, although it may be varied
more or less.
Two units of annealed slag.
Two units of lime.
Half unit of clean sand.
These plasters are mixed with water in application.
Having now described and ascertained the nature of my said invention, and in
what manner the same is to be performed, I declare that what I claim is:-
The manufacture of a wall plaster substantially as herein described--the claim
having narticuler referencin to the mintioon
T