IMPROVEMENTS IN FURROWING MILLSTONES
Year: 1879

page_text: LETTERS PATENT to Richard Sinith, of Gower Street, Stone, in the County of
Staffordshire, Miller, for the Invention of "IMPROVEMENTS IN FURROWING
MILLSTONES."
PROVISIONAL SPECIFICATION left by the said Richard Smith at the
Office of the Commissioners of Patents on the 29th November 1879.
RICHARD SMITH, of Gower Street, Stone, in the County of Staffordshire, Miller.
"IMPROVEMENTS IN FURROWING MILLSTONES."
This Invention consists of an improved arrangement of the furrows on the face
of millstones, whereby the ventilation of the working surfaces of the stones is
increased, without causing a too rapid delivery of the material being ground.
According to this Invention the ordinary set of furrows is traversed by a second
set formed at an opposite angle to that of the ordinary set, that is to say, whereas
the furrows in the ordinary set run in a direction on the surface of the stone, so
that the inner or eye ends are directed a certain distance on one side of the centre
of the stone, the furrows of the other set run in the opposite direction, so that
their inner or eye ends are directed to the other side of the centre of the stone.
The back or deep edge of the furrows in each set will be in the same circumferential
direction.
The advantages obtained by thus forming a double set of furrows running in
opposite directions on the grinding surfaces of millstones are,-
1st. An improved ventilation of the material being ground, which is thereby
delivered at a lower temperature than hitherto.
2nd. An increase in the per centage of middlings, without increasing the per
centage of bran.
3rd. A faster rate of grinding is effected.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Richard Smith in the Great Seal Patent Office on the 26th May
1880.
RICHARD SMITH, of Gower Street, Stone, in the County of Staffordshire, Miller.
"IMPROVEMENTS IN FURROWING MILLSTONES."
This Invention consists of an improved arrangement of the furrows on the face
of millstones, whereby the ventilation of the working surfaces of the stones is
increased, without causing a too rapid delivery of the material being ground.
According to this Invention the ordinary set of furrows is traversed by a second
set formed at an opposite angle to that of the ordinary set, that is to say, whereas
the furrows in the ordinary set run in a direction on the surface of the stone, so
that the inner or eye ends are directed a certain distance on one side of the centre
of the stone, the furrows of the other set run in the opposite direction, so that
their inner or eye ends are directed to the other side of the centre of the stone.
The back or deep edge of the furrows in each set will be in the same circumferential
direction.
The advantages obtained by thus forming a double set of furrows running in
opposite directions on the grinding surface of millstones are,-
1st. An improved ventilation of the material being ground, which is thereby
delivered at a lower temperature than hitherto.
2nd. An increase in the per centage of middlings, without increasing the per
centage of bran.
3rd. A faster rate of grinding is effected.
But in order that my Invention may be more clearly understood, I will proceed
to explain the same by the aid of the accompanying Sheet of Drawings, which
shows the surface of a stone divided into ten sections. 1 shows the second set of
furrows of the same pitch or distance apart as the ordinary furrows; 2 shows the
second set of furrows of lesser pitch or nearer together than the ordinary furrows;
and 3 shows the second set of furrows of greater pitch or farther apart than the
ordinary furrows. In each case A is the ordinary set of furrows, and B the second
Bet or cross furrows; a is the deep edge of the furrow of each set, and b the edge
which joins the grinding surface of the stone.
Having now described the nature of my Invention and the manner of carrying
the same into effect, I wish it to be understood that what I claim is, the manner of
furrowing millstones, which consists in traversing the ordinary set of furrows by a
second set formed at an opposite angle, as herein described and shown in the
accompanying Sheet of Drawings.
In witness whereof, I, the said Richard Smith, have hereunto set my hand
and seal, this Twenty-sixth day of May, in the year of our Lord 1880.
DIANART CUTTH