AN IMPROVED MILLSTONE FOR GRINDING CORN AND OTHER SUBSTANCES
Year: 1864

page_text: LETTERS PATENT to Jules Aubin, of Paris, Rue du Louvre, No. 8, Miller,
for the Invention of "AN IMPROVED MILLSTONE FOR GRINDING CORN AND
OTHER SUBSTANCES."
Sealed the 12th May 1865, and dated the 16th November 1864.
PROVISIONAL SPECIFICATION left by Jules Aubin at the Office of
the Commissioners of Patents, with his Petition, on the 16th November
1864.
I, JULES AUBIN, of Paris, Rue du Louvre, No. 8, Miller, do hereby
declare the nature of the said Invention for "AN IMPROVED MILLSTONE FOR
GRINDING CORN AND OTHER SUBSTANCES," to be as follows:-
This improved millstone is composed partly of stone and partly of metal, as
hereafter described.
I take an iron plate with a number of iron boxes cast upon it, which boxes
constitute hollow compartments. The stone proper is set upon this plate,
occupies the centre, and fills the interstices between the hollow compartments,
and is the grinding agent. Each compartment forms a kind of channel, and
is covered at top with a metallic or other cloth to act as a sieve, and afford
passage to the flour. Such a millstone answers at the same time for grinding,
bolting, and for aërating the flour. The top of each metallic compartment is
just below the level of the stone proper; and, in order to admit of adjustment
upon the wearing of the stone, I prefer to form the compartments in two parts;
the upper of which is capable of being lowered by screws upon the lower part.

page_text: In the rotation of the upper stone placed over my improved millstone the
grinding takes place in the ordinary manner, and the flour after passing
through the cloth or sieve in the metal compartment falls therein while the
bran or envelope is projected from the circumference of the stone.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Jules Aubin in the Great Seal Patent Office on the 16th
May 1865.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JULES
AUBIN, of Paris, Rue du Louvre, No. 8, Miller, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Sixteenth day of November, in the year of our
Lord One thousand eight hundred and sixty-four, in the twenty-eighth year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said Jules Aubin, Her special licence that I, the said
Jules Aubin, my executors, administrators, and assigns, or such others
as I, the said Jules Aubin, 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 "AN IMPROVED MILLSTONE FOR GRINDING CORN AND OTHER SUB-
STANCES," upon the condition (amongst others) that I, the said Jules Aubin,
my executors or administrators, by an instrument in writing under my, or
their, or one 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 Jules Aubin, 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 fol-
lowing statement thereof, reference being had to the Drawings hereunto
annexed, that is to say :-
This improved millstone is composed partly of stone and partly of metal,
as hereafter described. I take an iron plate with a number of iron boxes
cast upon it, which boxes constitute hollow bolting compartments.
The stone

page_text: proper is set upon this plate, occupies the centre, and fills the interstices be-
tween the hollow compartments, and is the grinding agent. Each compart-
ment forms a kind of channel, and is covered at top with a metallic or
other cloth to act as a sieve and afford passage to the flour. Such a millstone
answers at the same time for grinding, bolting, and for aërating the flour.
The top of each metallic compartment is just below the level of the stone
proper, and in order to admit of adjustment upon the wearing of the stone I
prefer to form the compartments in two parts, the upper of which is capable
of being lowered by screws upon the lower part. In the rotation of the upper
stone placed over my improved millstone the grinding takes place in the ordi-
nary manner, and the flour after passing through the cloth or sieve on the
metal compartments falls therein, while the bran or envelope is projected from
the circumference of the stone.
Figure 1 of the accompanying Drawings is a plan, and Fig. 2 a vertical
section of one of my improved millstones. Figure 3 is a section through the
line x, x, of Figure 2. B is a metal plate with a number of boxes A cast upon
it; each of these boxes is covered at top with metallic or other cloth C. D is
the stone proper; it is set upon the plate B, occupies the centre, and fills up
the interstices between the boxes A. In the rotation of the ordinary upper
stone X the grinding takes place in the ordinary manner between the two
stones X and D, the flour falls into the boxes A through the cloth C, while
the bran or envelope is as before stated projected from the circumference of
the stone. To facilitate the bolting and prevent the flour remaining on the
cloths C, I produce an intermittent agitation of the upper part M of the boxes
which receives the cloths. For this purpose I form an annular space round
the periphery of the stone D, between the upper and lower plates B' and B,
in which space at any convenient point I fit an excentric E actuated by a
shaft b. The excentric E by contact with a block T, on which is a ring or
disc f, produces a slight movement of this ring. The ring gives a proper
contour to the stone D, and on its surface I form blocks g, which by butting
against the ends of the upper parts M of the boxes, impart a shaking move-
ment to these parts, which repercusses on the cloths C, and thereby prevents
adhesion of the flour and facilitates the bolting by a sifting motion. The ring
fmay be connected by links or articulated joints i (see the detached views
Figures 4 and 5) or other analogous arrangement. I can avoid the con-
nection of the ring f with the blocks g, or dispense with these blocks by casting
with the ring keys equal, in number to the parts M. In the slight alternate
movement imparted to the disc by the excentric E, these keys which receive
the ends of the parts M transmit to them the vibratory motion which facili-

page_text: tates the bolting. The plates B, B³, are prevented from shaking by blocks
placed between them, or in any other convenient manner. The upper parts of
the boxes can be lowered when required, in order that as the stone D becomes
worn they may be prevented from coming in contact with the upper stone X.
The number, position, size, and shape of the boxes A, may be varied at..
will.
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that I claim, constructing
millstones with metal boxes or compartments let into the stone and covered
with metallic or other cloth, substantially in manner and for the purposes
herein-before described and illustrated in the accompanying Drawings.
In witness whereof, I, the said Jules Aubin, have hereunto set my
hand and seal, this Twenty-seventh day of April, One thousand eight
· hundred and sixty-five.
Witness,
CH. ARMENGAUD,
Civil Engineer,
.28, Boulev de Strasbourg,
à Paris.
J. AUBIN. (L.S.)