Improvements in Mill Stones.
Year: 1894

page_text: Date of Application, 4th Dec.. 1894
Complete Specification Left, 3rd Se.t. 1995-Accepted, 5th Oct., 1895
Improvements in Mill Stones.
I, CHARLES JOHN POTTER, of Heaton Hall, Newcastle-on-Tyne, in the County
of Northumberland, Cement Manufacturer, do hereby declare the nature of this
invention to be as follows:-
It has before been proposed to make mill stones (such as are employed for
grinding cement) of lumps of emery held together by cement or some fusible
metal.
Both of these plans have disadvantages, the cement is apt to flake off at the edges
or circumference of the stone whilst the metal is difficult to work so that there is
great trouble in truing the surface of the stone after wear.
According to this invention I avoid these difficulties by making the circumference
of the stone of lumps of emery embedded in metal and the body of the stone of
lumps of emery in cement.
The stone is built up as usual in a hoop of iron or steel. Inside this is placed a
ring formed of lumps of emery embedded in metal such as spelter, cast iron or lead.
The inner face of this ring is jagged or serrated so as to afford a hold for the
cement and the ring may either be cast in the hoop or may be built up of segments
cast separately. Around the eye of the stone there is as usual a ring of burr or
like material and the space between the metal and the burr is filled with concrete
made of lumps of emery and Portland cement.
Dated this 3rd day of December 1894.
CHAS. J. POTTER.
1, CHARLES JOHN POTTER, of Heaton Hall, Newcastle-on-Tyne, in the County
of Northumberland, Cement 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:-
It has before been proposed to make mill stones (such as are employed for
grinding cement) of lumps of emery held together by cement or soine fusible
metal.
Both of these plans have disadvantages, the cement is apt to flake off at the
edges or circumference of the stone whilst the metal is difficult to work so that
there is great trouble in truing the surface of the stone after wear.
According to this invention I avoid these difficulties by making the circumference
of the stone of lumps of emery embedded in metal and the body of the stone of
lumps of emery in cement.
The stone is built up as usual in a boop of iron or steel. Inside this is placed a
ring formed of lumps of emery embedded in metal such as spelter, cast iron or lead.
The inner face of this ring is jagged or serrated so as to afford a hold for the cement
and the ring may either be cast in the hoop or may be built up of segments cast
separately. Around the eye of the stone there is as usual a ring of burr or like
I Prina d

page_text: material and the space between the metal and the burr is filled with concrete made
of lunips of emery and Portland cement.
Figures 1 and 2 are plan views of two stones made according to this invention.
as a ring formed of lumps of emery embedded in metal the inner circumference
being jagged or serrated, this may be done in various ways, different methods
being shown at Figures 1 and 2. is a ring formed of lumps of emery embedded
in cement, preferably the pieces of emery in this ring are as shown larger than
those in the ring a. c is a ring of burr.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A mill stone in which the circumference consists of lumps of emnery embedded
in metal and the body of lumps of emery in cement substantially as described.
2. Mill stones substantially as described and shown in the drawings.
Dated this 23rd day of August 1895.
CHAS. J. POTTER.