IMPROVEMENTS IN CASES FOR MILLSTONES USED FOR GRINDING CORN OR OTHER SUBSTANCES
Year: 1882

page_text: LETTERS PATENT to Edmund Edwards, of the firm of Edwards and Co:,
Patent Agents and Engineers, of 40, Southampton Buildings, Chancery Lane,
in the County of Middlesex for an invention of "IMPROVEMENTS IN CASES
FOR MILLSTONES USED FOR GRINDING CORN OR OTHER SUBSTANCES "-A com-
munication to him from abroad by F. D. C. Iwand, of Breslau, in the Empire
of Germany
PROVISIONAL SPECIFICATION left by the said Edmund Edwards at the
Office of the Commissioners of Patents on the 23rd May 1882.
EDMUND EDWARDS of the firm of Edwards and Co, Patent Agents and'
Engineers, of 40, Southampton Buildings, Chancery Lane, in the County of
Middlesex "IMPROVEMENTS IN CASES FOR MILLSTONES USED FOR GRINDING CORN
OR OTHER SUBSTANCES [A communication to him from abroad by F. D. C. Iwand,
of Breslau, in the Empire of Germany]
"
This invention relates to that kind of mill in which a conical millstone of suit-
able material revolves within, but a short distance from, an external case ordinarily
made of porcelain, the corn or other substance being ground between them. It has
for its object an improved method of constructing such external case of a material
composed of the following ingredients, instead of ordinary porcelain :-
White-blue clay, containing about
Gray-blue clay,
5 per cent of iron
do
do
20 per cent of iron
do
15 per cent of iron
-
"
1
35 per cent :
20
"
39
-
30
"
37
of iron
5
"
"2
do do 20 per cent
of iron,
10
"
"
Clay, easily fusible, do
Blue clay, fusible with difficulty, containing about 2 per cent
Quartz, easily fusible,
100 per cent :
By the action of the iron as a flux, a very tough material is produced, the
surface of which never becomes polished by friction, but always remains rough and
coarse-grained.
The material thus produced, is made into plates, which are fitted and cemented
by means of alum into the interior of an external cast-iron case which surrounds
the revolving millstone, the plates being suitably curved in section.

page_text: By the action of the iron as a flux, a very tough material is produced, the surface
of which never becomes polished by friction, but always remains rough and coarse
grained.
The material thus produced is made into plates, which are fitted and cemented.
by means of alum into the interior of an external cast iron case which surrounds'
the revolving millstone, the plates being suitably curved in section.
The accompanying drawing is in illustration of the method of using the materials
described for the purpose of the invention, figure 1 being a vertical section through
the line A B in figure 2, and figure 2 being a horizontal section through the line CD
in figure 1, of a millstone and' case. The same letters of reference indicate the
same parts in both figures. S is the revolving stone, and P. P; are the plates, made
from the above-described' materials, which form the case.
These plates P are cemented by means of alum into the external cast iron
casing M.
Having now described the invention and the manner in which it is to be
performed,, I claim-the method of making cases for millstones of the materials
and in about the proportions described, substantially in the manner set forth and
shewn in the drawing.
In witness whereof I, the said Edmund Edwards have hereunto set my hand
and seal this twenty, second day of November in the year of our Lord
1882
EDMUND EDWARDS (L.S.)