IMPROVEMENTS IN Apparatus foR DRESSING MILLSTONES
Year: 1871

page_text: LETTERS PATENT to George Ramsay Hay, of Glasgow, in the County
of Lanark, North Britain, for the Invention of "IMPROVEMENTS IN
Apparatus foR DRESSING MILLSTONES."
Sealed the 30th May 1871, and dated the 7th February 1871.
PROVISIONAL SPECIFICATION left by the said George Ramsay Hay
at the Office of the Commissioners of Patents, with his Petition, on
the 7th February 1871.
I, GEORGE RAMSAY HAY, of Glasgow, in the County of Lanark, North
Britain, do hereby declare the nature of the said Invention for “IMPROVE-
MENTS IN APPARATUS FOR DRESSING MILLSTONES," to be as follows :—
-
My Invention relates to that class of apparatus in which diamonds
or other hard stones or materials (hereafter called diamonds) are
employed to attack the grinding surfaces of millstones by a chipping, a
ploughing, or an abrading action for the purpose of forming the required
fine grooves or cracks, and consists in so disposing an increased number

page_text: of tools and tool holders and in constructing part of the tool carriage
that the dressing capabilities of such apparatus are largely increased, in
fact, each apparatus or machine is rendered capable of performing at
least double the present amount of dressing in the same time, and this
with less manual labour.
Under my Invention two (more than two may be used) tool holders
fitted with diamond tools are mounted on the same spindle or piece at
such distance apart, usually the width of a land and furrow of a mill-
stone, that either end of the said spindle or piece and the tool holder
and diamond tool nearest that end can be raised or lowered at will
by adjusting screw or their mechanical equivalents without practically
affecting the diamond tool and its holder nearest the other end. The
object of raising or lowering one or the other, or it may be both, of the
ends of the said spindle or piece is to bring both diamonds into position
to act simultaneously in the same plane as regards the bottom of the
grooves on different parts of the millstone. To provide for the raising
and lowering of the ends of the spindle or piece and the adjusting thereby
of the diamond tools the frame or that part of the tool carriage which
supports the tool holder, spindle, or piece is constructed of two pieces
joined or connected by a bolt or pin, whereon they are free to be moved
independantly by the adjusting screws or their equivalents; or the
tool carriage is provided with movable side pieces fitted with centres,
sockets, or catches to receive the tool holder, spindle, or piece.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Ramsay Hay in the Great Seal Patent 2
Office on the 7th August 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
RAMSAY HAY, of Glasgow, in the County of Lanark, North Britain, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her 3
Letters Patent, bearing date the Seventh day of February, in the
year of our Lord One thousand eight hundred and seventy-one in the
thirty-fourth year of Her reign, did for Herself, Her heirs and successors,
give and grant unto me, the said George Ramsay Hay, Her special

page_text: license that I, the said George Ramsay Hay, my executors, adminis-
trators, and assigns, or such others as I, the said George Ramsay
Hay, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for
“IMPROVEMENTS IN APPARATUS FOR DRESSING MILLSTONES," upon the condition
(amongst others) that I, the said George Ramsay Hay, my executors or
administrators, by an instrument in writing under my, or their, or any of
their hands and seals, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the
said Letters Patent.
NOW KNOW YE, that I, the said George Ramsay Hay, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement, reference being had to the accompanying
Sheet of illustrative Drawings, and to the figures and letters marked
thereon, that is to say :-
My Invention relates to that class of apparatus in which diamonds
or other hard stones or materials (herein-after called diamonds) are
employed to attack the grinding surfaces of millstones by a chipping, a
ploughing, or an abrading action for the purpose of forming the required
fine grooves or cracks, and consists in so disposing an increased number
of tools and tool holders, and in constructing part of the tool carriage
that the dressing capabilities of such apparatus are largely increased, in
fact, each apparatus or machine is rendered capable of performing at
least double the present amount of dressing in the same time, and this
with less manual labour.
Under my Invention two (more than two may be used) tool holders
fitted with diamond tools are mounted on the same spindle or piece at
such distance apart, usually the width of a land and furrow of a mill-
stone, that either end of the said spindle or piece and the tool holder and
diamond tool nearest that end can be raised or lowered at will by adjusting
screws or their mechanical equivalents, without practically affecting the

page_text: screw is raised, and the set screw j lowered; the part d of the tool
carrier is thereby caused to turn on the pin. f and centre e, whilst the
part of the tool carrier remains in its previous position. When it is
desired to raise hj is raised, and 7 lowered. The movement of the
screws j² and j³ in a similar manner to that above described as regards
jand affects the part & and tool holder ¹ in an equivalent manner.
A modification of the above under which attacking diamonds can be
placed at the required distance apart to secure the desired result, and be
adjustable separately, can be made by employing two spindles, and
affixing diamond holders at opposite ends of the said spindles.
Fig. 3 is an end elevation, Fig. 4 a side elevation, and Fig. 5 a plan,
all of part of a millstone dressing machine constructed and arranged in
accordance with my Invention, that is to say, part of a millstone
dressing machine in which diamonds are made to act on the millstone
so as to cut the fine grooves by a ploughing, or what is sometime called
a simple rectilinear action. Like letters denote the same part in these
views.
7 is the bar; m, sliding carriage; n, n', independent side pieces,
movable on the centres o, o³, and carrying the tool holders p, p³, such
tool holders being made disc like and formed with recesses for diamonds.
These holders might be made spindle like with a cell for a diamond at
its lower end. 9, g¹, g³, and g³, set screws for adjusting n, n¹, and the
parts carried thereby. It will be evident that the parts might be
arranged so as to admit of the fixing of tool holders at or near the other
ends of n and n¹.
When diamonds having an abrading action are used the spindles are
placed at the required distance apart, and they are arranged to be raised
or lowered independently. By an abrading action I mean an action under
which each diamond is caused to rotate about an axis perpendicular to
the face of the stone being dressed during the travelling of the said
diamond. The position of the attacking diamonds at a distance apart
with relation to the separate adjusting of the parts of the tool carrier and
attacking tools are the features whereby different lands or parts of a
millstone can be dressed at the same time, and the advantages herein-
before set forth secured.
Having now described the nature of my said Invention, and par-
ticularized the same in such manner that others will be enabled to make

page_text: and use my said apparatus, I claim, dressing millstones by apparatus
constructed, arranged, combined, and operating substantially as herein
set forth.
In witness whereof, I, the said George Ramsay Hay, have hereunto
set my hand and seal, this Fifth day of August, in the year of
our Lord One thousand eight hundred and seventy-one.
GEO. RAMSAY HAY. (L.S.)
In the presence of
JOHN ALEXANDER SPENS,
Of One hundred & sixty-nine, West George Street,
Glasgow,
Writer.