IMPROVEMENTS IN MACHINERY OR APPARATUS FOR SURFACING AND DRESSING MILLSTONES."
Year: 1877

page_text: LETTERS PATENT to Jonathan Edge, of Bolton, in the County of Lancaster,
Engineer, for the Invention of "IMPROVEMENTS IN MACHINERY OR APPARATUS
FOR SURFACING AND DRESSING MILLSTONES."
PROVISIONAL SPECIFICATION left by the said Jonathan Edge at the Office
of the Commissioners of Patents on the 27th December 1877.
JONATHAN EDGE, of Bolton, in the County of Lancaster, Engineer. "IMPROVE-
MENTS IN MACHINERY OR APPARATUS FOR SURFACING AND DRESSING MILLSTONES."
The object of my Invention is,-
First. To indicate the presence of any projections on the surfaces of millstones.
And, Secondly. To dress millstones by means of revolving emery cutters.
The machinery or apparatus for indicating projections on the surfaces of mill-
stones consists of a plate, which is supported by a pivot coinciding with the centre
of the millstone, and with two feet supported on the face and near the circuinference
of the millstone; this plate can be raised and lowered by a screw, and the under
surface is painted; the whole apparatus is turned round on its pivot over the
surface of the millstone, and if any parts project they are marked by the paint on
the under side of the plate.
The machinery or apparatus for dressing the furrows in millstones consists of a
bed plate or frame, which is fixed to the axle of the millstone at any required
angle; on this bed plate is a slide with headstocks supporting the axle of an emery
wheel, which is turned rapidly round by a band passing over guide pulleys; the
slide is moved to and fro to cause the emery wheel to cut the furrows by hand
power, or by a screw and nut or other equivalent.
The bed plate or frame is supported by the axle, as above described, and by two
feet resting upon the face of the millstone. By this means the bevel furrows are

page_text: cut by a square-faced emery wheel, and when the furrows are cut the axle of the
emery wheel is set parallel with the face of the millstone; the emery wheel is then
traversed to and fio to make the surface of the millstone and of the emery wheel
true.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Jonathan Edge in the Great Seal Patent Office on the 26th June
1878.
"IMPROVE
JONATHAN EDGE, of Bolton, in the County of Lancaster, Engineer.
MENTS IN MACHINERY'OR APPARATUS FOR SURFACING AND DRESSING MILLSTONES."
The nature of my Invention consists,—
First. In certain improved machinery or apparatus for indicating the presence of
any projections on the surfaces of millstones
And, Secondly. In improved machinery for cutting the furrows in and dressing
the surface of millstones by means of revolving emery wheels or cutters.
And in order that my Invention may be fully understood I will proceed to
describe the accompanying Sheet of Drawings, in which,
Fig. 1 is a front view; Fig. 2, a side view, and Fig. 3, a plan of my improved
machinery or apparatus for indicating projections on the surface of millatones..
The machinery or apparatus consists of the radial arm a, which is supported by
the pivot b' working in the centre of the millstone c. To the radial arm, a is
cast the V shaped slide a', on which the centre of the plate or straight edge d fits;
this plate has two arms supported on the face of the millstone near its circumference,
and it can be raised or lowered by the screw d', and the under surface is painted
or covered with raddle; the whole apparatus is turned round on its pivot over the
surface of the millstone, and if any parts project they are marked by the paint or
raddle on the under side of the plate d.
Fig 4 is a front view; Fig 5, a side view; and Fig. 6, a plan of my improved
machinery or apparatus for cutting the furrows in and for dresing the surface
of millstones.
zz
The bed plate or frame e is fixed to the axle fof the millstone at any required
angle; on this bed plate or frame is mounted the slide g with the headstocks g¹
supporting the axle h of the emery wheel h', which can be set at any angle for
cutting the furrows, and is turned rapidly round by the band i, driven by the
pulley f¹ on the axle f, and passing over the guide pulleys to the pulley h³, which
serves as a washer to the emery wheel h¹. The slide g is moved to and fro to cause
the emery wheel to cut the furrows by hand power, the attendant acting on the
cross bar g, or by a screw and nut or other équivalents. The bed plate or frame e
is supported by the axle f, as above described, and by two feet e¹ resting upon the
face of the millstone c. By this means the bevel furrows are cut by a square faced
emery wheel which is set to the required angle, and when the furrows have been
cut the axle of the emery wheel is set parallel with the face of the millstone, the

page_text: emery wheel is then traversed to and fro to make the surfaces of the millstone and
of the emery wheel true.
Having thus stated the nature of my Invention and described the manner of
performing the same, I wish it to be understood that I do not intend to limit
myself to the details given as the same may be varied, but what I claim is,-
First. The machinery or apparatus, shewn in Figs. 1, 2, and 3, for indicating the
presence of projections on the surfaces of millstones.
And, Secondly. The machinery or apparatus, shewn in Figs. 4, 5, and 6, for cutting
the furrows in and for dressing millstones by means of emery wheels.
In witness whereof, I, the said Jonathan Edge, have hereunto set my hand
and seal, this Twenty-fourth day of June, One thousand eight hundred and
seventy-eight.
JONATHAN EDGE. (L.S.)