AN IMPROVE- MENT IN MILLS FOR GRINDING AND FLOURING GRAIN
Year: 1868

page_text: LETTERS PATENT to Edward Harrison, of the City of New Haven,
in the County of New Haven, and State of Connecticut, Manu-
facturer of Grinding Mills, for the Invention of "AN IMPROVEMENT
PROVISIONAL SPECIFICATION left by the said Edward Harrison at
the Office of the Commissioners of Patents, with his Petition, on
the 20th October 1868.
I, EDWARD HARRISON, of the City of New Haven, in the County of
New Haven, and State of Connecticut, Manufacturer of Grinding Mills,
do hereby declare the nature of the said Invention for "AN IMPROVE-
MENT IN MILLS FOR GRINDING AND FLOURING GRAIN," to be as follows:-
This Invention relates to improvements in mills for grinding grain,
the object being to combine with the mill casing the bolt, so that the
flour and the hulls may be discharged separately from the same mill,
which constitutes the first part of my Invention. The second part of my

page_text: Invention has for its object to reduce the cost of construction and
increase the durability of the mill; and the Invention consists,―
First. In the arrangement of a bolt, cloth, or screen around the
stones, so that the meal in passing from the stones is thrown against
the bolt cloth, the fine or flour portion passing through the cloth to
one exit while the coarse or hull portion is driven out at another exit,
separating the one entirely from the other.
Secondly. In constructing the husk for the runner casing with the
supporting frame, shaft, bearings, and sockets for the support of the
hopper and half of the discharge spout, in one and the same piece
whereby a large amount of fitting, numerous bolts, and other expenses
of combining the parts is avoided.
Thirdly. In casting the husk for the fixed or bed stone, the other half
of the discharge spout, feeding spout, and bearing for the shaft in one
and the same piece.
Fourthly. In attaching the hopper to the mill by forming conical
studs upon the under side of the. hopper, placing the said studs into
the sockets on the runner husk, and pouring metal around the said studs
so as to make a perfect fit and adjustment of the hopper while the
sockets are formed solidly on the husks.
Fifthly. In the arrangement of the rocker or feeding shoe beneath the
mouth of the hopper so as to be operated by an excentric on the driving
pulley to vibrate or rock the shoe to conduct the grain from the hopper
to the feeding spout.
Sixthly. In fixing a band centrally upon the edge of the stone or
stones, which said band forms a bearing for the stones so that they may be
reversed and replaced in their proper positions, the two sides of each being
parallel the one to the other. Also in securing the, stones, one to the
runner plate, the other to the bed stone casing, by means of the said band.
I will now proceed to describe my Invention as illustrated in the
following Figures, which represent in-
Fig. 1, a side view;
ور
2, a front view;
3, a longitudinal central section;
4, a vertical section between the two stones;
"
5,
and 7, modifications of my Invention.

page_text: A is the casing. of the mill constructed in any convenient form,
centrally through which passes a shaft B supported in a bearing C,
and in an adjusable step D, an caused to revolve by the application of
power thereto through the pulley E. In the said shaft is fixed a plate F
with a hub. G so as to receive and carry the runner stone H, and in a
position corresponding to the runner stone H the bed stone I is arranged
within the case as seen in Fig. 3. With the case between the stones and
case and surrounding the stones, I place a cylinder K of bolt cloth, as
seen in Figs. 3 and 4, supported in the case so that the runner stone
will revolve freely within the fixed bolt cloth, as seen in Fig. 3, the bolt
cloth secured to a fixed plate L upon. one side, and by a ring << upon
the other edge, and these secured by bolts d. To the edge of the
runner stone casing or plate. F are fixed sweeps c more or less in
number (by preference two), which as, the runner stone revolves sweep
around between the bed stone and bolt cloth, and to the shaft I fix
other sweeps b, as seen in Figs. 3 and 4, so as to revolve in the space
between the bolt cloth and the inner surface of the casing in close
proximity to the bolt cloth; M is the outlet from the casing outside the.
bolt cloth, see Fig. 4; N is the outlet between the bolt cloth and the
stone as seen in Fig. 3; P is the hopper into which the grain is placed,
opening through the bed stone I, as seen in Fig. 3.
At the said opening
is arranged a worm R fixed to the shaft B and so as to revolve there-
with, which revolving in the mass of grain at the entrance to the mill,
draws the grain into the mill to be ground. The runner stone in motion,
the grain is drawn between the stones in the usual manner, passing out
between the stones as fast as ground, and by the centrifugal force of the
revolving stones the meal is thrown against the bolt cloth, and the sweeps c
serve to keep the meal in agitation between the bolt cloth and the stones,
and this by the rapid revolution of the stones forces the finer portion or
flour through the bolt cloth, which is brushed or swept from the bolt
cloth by other sweeps 6 and by the said sweeps the flour is forced out
through the opening M, while the coarser portion which cannot pass.
through the bolt cloth is forced by the sweeps c out through the opening.
N between the bolt cloth and the stones. The sweeps are inclined upon
their advancing edge toward the outlet N which facilitates the passage
of the coarser portion to that side of the mill and consequently out
from the mill. This arrangement of the bolt cloth relative to the stones.
is alike applicable to all mills for grinding grain, whether horizontal or
vertical. The position of the outlets M and N may be varied as it is

page_text: not essential at which point around the mill they are placed. It is often
desirable in grinding wheat to produce two qualities or grades of flour,
which is accomplished by the use of two bolt cloths of different meshes.
In Fig. 5 I illustrate my arrangement for producing two grades of
flour. The different parts of the mill are represented by the same
letters, but in addition to the bolt cloth K I place between that and
the case a second bolt cloth S, also making an additional outlet T
between the two bolt cloths, the outer cloth S being of a finer mesh
than the inner, and I also arrange an additional sweep between the two
cloths. By this arrangement that portion of the flour which will pass
the first bolt cloth enters the space between the two holt cloths and
is there separated, the finer portion passing through the cloth S, while
the coarser portion passes through the outlet T. Other bolt cloths
for further grading of the flour may be added in like manner.
In Fig. 6 I shew a different modification for producing different
grades of flour. I employ as in the first instance a single bolt cloth,
but of two different meshes m and n, n being the finer, and I form a
ring or partition / around the space between the bolt cloth and casing,
so that the portion of flour which passes through one bolt cloth cannot
enter into the chamber where the flour from the other chamber passes,
and I form a separate outlet M and T for the separate spaces, therefore
only the finest portion of the flour will pass through the part n, while
the coarser will pass out through the part m of the bolt cloth, and
each quality through its respective outlet, the bran passing-out separated
as before. I have thus far represented the bolt cloth as arranged
entirely around the stones, and have also represented the sweeps as
being fixed within the case to the shaft. It will, however, be readily
seen that the bolt cloth need not extend entirely around, as a portion
of the cylinder may be of solid material, the flour only passing out of the
perforated or cloth portion of the cylinder, and it will also be readily
seen that the sweeps may be detached from and driven independent
of the shaft by arranging a plate, ring, or wheel within the case, with
projecting arms to act as sweeps and communicating power to the
said plate from outside the cylinder.
In Fig. 7 I shew a still different modification or arrangement of the
bolt cloth. In this the bolt cloth K is simply placed over the outlet
from the casing; this arrangement serves a good purpose when it is
not desirable to entirely separate the flour from the hulls. In this

page_text: construction the grain when ground is thrown against the cloth K,
the finest portion of which will pass through and escape at the outlet M,
while the coarser portion will escape at another outlet with the hulls
or bran, thus in the same mill producing both meal and flour. I have
thus succeeded in producing a mill of very little enlarged dimensions
which combines within itself both a grinding and bolting apparatus,
an advantage over other mills and bolting apparatus which is too
apparent to require that more be said in explanation. This completes
the first part of my Invention.
I will now proceed to describe the second part, which is illustrated in
the following Figures, representing in-
Fig. 8, a front view;
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9, a side view;
33
10, a vertical central section;
"
11, a perspective view of each of the stones;
12, the rocker detached;
13, a sectional view shewing the manner of attaching the hopper.
A is the runner, husk, or casing; B, the discharge spout, onc-half of
which is cast upon the said casing; C is the supporting frame attached
or made a part of the casing by means of the arms D which extend
from the said frame C to the casing A, and in the said frame C at E,
and in the casing A at F is formed a bearing for the shaft G, and upon
the casing A are formed two sockets H, H, for the hopper, all in one and
the same piece. Heretofore the frame has been made in several parts
all fitted and secured together and to the casing by means of bolts,
and the hopper connecting have also been formed separate and attached
by bolts for the purpose more fully hereafter shewn, but in this
Invention they are all cast solidly together, thereby avoiding the
expence of bolting and fitting. A¹ is the bed stone case, having
formed upon its outer surface a feeding spout B' and chamber C¹ and
bearing E¹ for the shaft, and also the other half or the discharge
spout B all in one and the same piece, thus avoiding the bolting and
fitting heretofore required, the two parts of the case A and A' are
fitted together and secured by bolts D', thus forming a complete casing
and the bearings of the mill in but two parts, whereby a large portion
of the expense of construction heretofore required is avoided. Within
the casing A and upon the shaft G is arranged the runner plate or
the bed I, see Fig. 10. The runner stone J is constructed in the usual

page_text: manner for millstones, but upon the edge of the stone and centrally
I place a metallic flange or band L, see Fig. 4; the two surfaces of
the stone being formed parallel to each other, the flange L when laid
upon the plate I as in Fig. 10 will present the grinding surface of
the stone the same whichever of the two surfaces are presented,
the bearing of the stone being upon the flange therefore when one
of the surfaces becomes worn the stone may be easily reversed, the
flange presenting it in proper position without other adjustment, and by
means of the said flange I secure the stone to the runner plate I by
screws 7, as seen in Fig. 10, a sufficient number of screws being
employed to firmly secure the stone to the plate. It is necessary that
the stones be always secured in the same position in order that the
balance of the runner stone be maintained, and that the meeting
surfaces of the two be always in the same relative position to each
other. To insure this I form a notch x in the flange L, into which
one of the securing screws set, therefore when the stones or either
of them are replaced after having been removed for any purpose they
must be replaced so that the notch a be presented to the same screw.
Other means of indicating the position may be employed, but this I
prefer; one end of the shaft rests in a bearing E' supported in the centre
by a bearing F, and in the rear in the bearing E by an adjustable sleeve
E fitted into the end of the shaft, and so as to bear against the end as
seen in Fig. 10, and upon the said sleeve inside the bearing E is arranged
a nut F', so that by the turning of the nut the sleeve E² may be drawn
in so as to force the shaft forward and with it the runner stone; a spline
or other device should be applied to the sleeve to prevent its turning
with the shaft. Upon the said shaft is fixed a driving pulley D³ to
which power is applied to cause the shaft to revolve, and with it the
runner stone in any convenient manner; M is the bed stone constructed
with a flange upon its edge in like manner as the runner stone before
described, and is screwed into the bed stone husk, as in Fig. 10, in like
manner and with the same object as the runner is secured into its
place, the centre opening through the bed stone being sufficiently large to
permit the passage of the grain between the two stones. Upon the
shaft G and withing the chamber C' I arrange a worm which revolves
with the shaft so as to draw the grain from the chamber C¹ through the
opening in the bed stone to the stones to be ground; N is the hopper of
usual form, and upon its under side are formed or attached conical
studs (Fig. 9). The sockets on the casing A have a recess cast upon

page_text: hopper and half of the discharge spout, in one and the same piece,
whereby a large amount of fitting, numerous bolts, and other expenses
of combining the parts is avoided.
Thirdly. In casting the husk for the fixed or bed stone, the other half
of the discharge spout, feeding spout, and bearing for the shaft in one
and the same piece.
Fourthly. In attaching the hopper to the mill by forming conical
studs upon the under side of the hopper, placing the said studs into
sockets on the runner husk, and pouring metal around the said studs so
as to make a perfect fit and adjustment of the hopper, while the sockets.
are formed solidly on the husks.
Fifthly. In the arrangement of the rocker or feeding shoe beneath the
mouth of the hopper so as to be operated by an eccentric on the driving
pulley to vibrate or rock the shoe to conduct the grain from the hopper
to the feeding spout.
Sixthly. In fixing a band centrally upon the edge of the stone or
stones, which said band forms a bearing for the stones so that they may
be reversed and replaced in their proper positions, the two sides of cach
being parallel the one to the other. Also, in securing the stones, one
to the runner plate, the other to the bed stone casing,. by means of the
said band.
I will now proceed to describe my Invention as illustrated in the
following Figures, which represent in Fig. 1 a side view, Fig. 2 a front
view, Fig. 3 a longitudinal central section, Fig. 4 a vertical section
between the two stones, Figs. 5, 6, and 7 modifications of my Invention.
A is the casing of the mill constructed in any convenient form,
centrally through which passes a shaft B supported in a bearing C, and
in an adjustable step D, and caused to revolve by the application of
power thereto through the pulley E. On the said shaft is fixed a plate F
with a hub G, so as to receive and carry the runner stone H, and in a
position corresponding to the runner stone H the bed stone I is arranged
within the case as seen in Fig. 3. With the case, between the stones and
case and surrounding the stones, I place a cylinder K of bolt cloth as
scen in Figs. 3 and 4, supported in the case so that the runner
stone will, revolve freely within the fixed bolt cloth as seen in Fig. 3,
the bolt cloth secured to a fixed plate L upon one side and by a.
ring a upon the other edge, and these secured by bolts d. To the
edge of the runner stone casing or plate F are fixed sweeps
morc

page_text: or less in number (by preference two) which as the runner stone revolves
sweep around between the bed stone and bolt cloth; and to the shaft I
fix other sweeps b, as seen in Figs. 3 and 4, so as to revolve in the space
between the bolt cloth and the inner surface of the casing in close
proximity to the bolt cloth. M is the outlet from the casing outside
the bolt cloth, see Fig. 4. N is the outlet between, the bolt cloth and
the stone, as seen in Fig. 2. P is the hopper into which the grain is
placed, opening through the bed stone I, as seen in Fig. 3; at the said
opening is arranged a worm R fixed to the shaft -B, and so as to revolve
therewith, which revolving in the mass of grain at the entrance to the
mill draws the grain into the mill to be ground. The runner stone in
motion, the grain is drawn between the stones in the usual manner,
passing out between the stones as fast as ground, and by the centrifugal
force of the revolving stones the meal is thrown against the bolt cloth,
and the sweeps c serve to keep the meal in agitation between the bolt
cloth and the stones, and this by the rapid revolution of the stones forces
the finer portion or flour through the bolt cloth which is brushed or
swept from the bolt cloth by other sweeps b, and by the said sweeps 6 the
flour is forced out through the opening M, while the coarser portion
which cannot pass through the bolt cloth is forced by the sweeps c out
through the opening N between the bolt cloth and the stones. The sweeps
are inclined upon their advancing edge toward the outlet N, which
facilitates the passage of the coarser portion to that side of the mill and
consequently out from the mill. This arrangement of the bolt cloth
relative to the stones is alike applicable to all mills for grinding grain
whether horizontal or vertical. The position of the outlets M and N
may be varied, as it is not essential at which point around the mill they
are placed. It is often desirable in grinding wheat to produce two
qualities or grades of flour, which is accomplished by the use of two
bolt cloths of different meshes.
In Fig. 5 I illustrate my arrangement for producing two grades of
lour. The different parts of the mill are represented by the same letters,
but in addition to the bolt cloth K I place between that and the case a
second bolt cloth S, also making an additional outlet T between the two
bolt cloths, the outer cloth S being of a finer mesh than the inner, and I
also arrange an additional sweep f between the two cloths. By this
arrangement that portion of flour which will pass the first bolt cloth
enters the space between the two bolt cloths, and is there separated, the
finer portion passing through the cloth S, while the coarser portion

page_text: their upper ends corresponding nearly to the studs n on the hopper. The
hopper set into the position, the studs n in the sockets, then in the space
around the studs in the sockets metal is poured to fill the space and thus
fit the hopper in its seat; which when the metal is cool may be removed at
pleasure. Heretofore in the attachment of the hopper it has been
required to fit the connections and then attach them to the casing, which
necessitates a considerable amount of labor, which by my improvements
is avoided, and by which improvement I am enabled to cast the sockets
solidly on the casing. Beneath the hopper is arranged the shoe or
rocker P of the usual form, from which extends a lever pivoted at R on
the casing with an arm extending down and forked over an eccentric Sin
the pulley De, as scen in Figs. 10 and 12, so that by the revolving of the
pulley the eccentric vibrates or rocks the shoe, as denoted in Fig. 12,
and as the revolution of the pulley is very rapid the rocking or vibrating
motion of the shoe agitates the grain sufficiently to force it from the
shoe to fall into the feeding spout B', from whence it is conducted to the
stones. The hopper is arranged with a slide T for the purpose of
adjusting the quantity of grain which enters the shoe. Thus constructing
and operating, if it is required to grind finer, turn the nut F to drawer
in sleeve E2, and thus force the runner stone nearer to the bed stone, or
if to grind coarser, reverse.
Another advantage than that which I have described for constructing
the stones with the flange L is that the opposite side of the stones may
be prepared to grind the one for flour, the other for ordinary meal, so
that the same mill may answer a double purpose by simply reversing the
stones. It is not essential that the stones be double-faced to make the
flange L applicable, as that may be employed upon a single-faced stone
with great advantage as a means of adjusting and securing the stone;
therefore do not confine myself to the use of the flange for double-faced
or reversable stones.
I
SPECIFICATION- in pursuance of the conditions of the Letters Patent,
filed by the said Edward Harrison in the Great Seal Patent Office
on the 20th April 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDWARD
HARRISON, of the City of New Haven, in the County of New Haven,
and State of Connecticut, Manufacturer of Grinding Mills, send
recting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twentieth day of October, in the year of our
Lord One thousand eight hundred and sixty-eight, in the thirty-second
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Edward Harrison, Her special licence that I,
the said Edward Harrison, my executors, administrators, and assigns, or
such others as I, the said Edward Harrison, my executors, adminis-
trators, 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 IMPROVEMENT IN MILLS FOR
GRINDING AND FLOURING GRAIN," upon the condition (amongst others)
that I, the said Edward Harrison, 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 Edward Harrison, 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 and accompanying three Sheets of Drawings
(that is to say)
This Invention relates to improvements in mills for grinding grain, the
object being to combine with the mill casing the bolt so that the flour
and the hulls may be discharged separately from the same mill, which
constitutes the first part of my Invention. The second part of my
Invention has for its object to reduce the cost of construction and
increase the durability of the mill; and the Invention consists,―
First. in the arrangement of a bolt cloth or screen around the stones,
so that the meal in passing from the stones is thrown against the bolt
cloth, the fine or flour portion passing through the cloth to one exit,
while the coarse or hull portion is driven out at another exit, separating
the one entirely from the other.
Secondly. In constructing the husk for the runner casing with the
supporting frame, shaft, bearings, and sockets for the support of the

page_text: To
of the two be always in the same relative position to each other.
ensure this I form a notch a in the flange L into which one of the
securing screws set, therefore when the stones, or either of tliem, are
replaced after having been removed for any purpose they must be
replaced so that the notch x be presented to the same screw. Other
means of indicating the position may be employed, but this I prefer.
One end of the shaft rests in a bearing E', supported in the centre by a
bearing F, and in the rear in the bearing E by an adjustable sleeve E*,
fitted into the end of the shaft and so as to bear against the end, as seen
in Fig. 10, and upon the said sleeve inside the bearing E is arranged a
nut ", so that by the turning of the nut the sleeve E may be drawn
in so as to force the shaft forward, and with it the runner stone. A
spline or other device should be applied to the sleeve to prevent its
turning with the shaft. Upon the said shaft is fixed a driving pulley D³, to
which power is applied to cause the shaft to revolve and with it the runner
stone in any convenient manner. M is the bed stone constructed with
a flange upon its edge in like manner as the runner stone before
described, and is screwed into the bedstone husk, as in Fig. 10, in like
manner and with the same object as the runner stone is secured into its
place, the centre opening through the bed stone being sufficiently large
to permit the passage of the grain between the two stones. Upon the
shaft G and within the chamber C¹ I arrange a worm which revolves
with the shaft so as to draw the grain from the chamber C¹ through
the opening in the bed stone to the stones to be ground. N is the
hopper of usual form, and upon its under side are formed or attached
conical studs 1. The sockets on the casing A have a recess cast upon
their upper ends, corresponding nearly to the studs n on the hopper.
The hopper set into position and the studs n in the sockets, then in the'
space
around the studs in the sockets metal is poured to fill the space
and thus fit the hopper in its seat, which when the metal is cool may
be removed at pleasure.
.
Heretofore in the attachment of the hopper it has been required to
fit the connections and then attach them to the casing, which necessitates
a considerable amount of labor, which by my improvements is avoided,
and by which improvements I am enabled to cast the sockets solidly on
the casing.
་
Beneath the hopper is arranged the shoe or rocker P of the usual form,
from which extends a lever pivoted at R on the casing with an arm

page_text: extending down and forked over an eccentric S on the pulley D2, as
seen in Figs. 10 and 12, so that by the revolving of the pulley the
eccentric vibrates or rocks the shoe, as denoted in Fig. 12, and as the
revolution of the pulley is very rapid the rocking or vibrating motion of
the shoe agitates the grain sufficiently to force it from the shoe to fall
into the feeding spout B', from whence it is conducted to the stones.
The hopper is arranged with a slide T for the purpose of adjusting the
quantity of grain which cuters the shoe. Thus constructing and
operating if it is required to grind finer, turn the nut F¹ to draw in the
sleeve E, and thus force the runner stone nearer to the bed stone, or if
to grind coarser, reverse.
Another advantage than that which I have described for constructing
the stones with the flange L is that the opposite sides of the stones m y
be prepared to grind, the one for flour, the other for ordinary meal, so
that the same mill may answer a double purpose by simply reversing
the stones. It is not essential that the stones be double faced to make
the flange L applicable, as that may be employed upon a single faced
stone with great advantage as a means of adjusting and securing the
stone; I therefore do not confine myself to the use of the flange for
double-faced or reversible stones.
Having fully described my Invention, what I claim as new and useful
and desire to secure by Letters Patent is,-
First. The arrangement with the casing which encloses the stones of
one or more bolt cloths, so as to separate the finer from the coarser
portion of meal within the casing of the mill, substantially as set
forth.
Second. In combination with the above I claim the arrangement of
one or more sweeps c, substantially as and for the purpose specified.
Third. In combination with the subject-matter of the first claim I
claim one or more sweeps b, substantially as and for the purpose
specified.
Fourth. The husk or runner case A, constructed in one and the same
picce with the discharge spout B, frame C, connections D, bearings
E and F, and sockets H, H, substantially as set forth.
Fifth. The bed stone casing A', constructed in one and the same piece
with the discharge spout B, feeding spout B', chamber C', bearing E',
as and for the purpose specified.

page_text: passes through the outlet T. Other bolt cloths for furtlier grading of
the flour may be added in like manner.
In Fig. 6 I show a different modification for producing different grades
of flour. I employ as in the first instance a single bolt cloth, but of
two different meshes m & n, n being the finer; and I form a ring or
partition around the space between the bolt cloth and casing, so that
the portion of flour which passes through one bolt cloth cannot enter
into the chamber where the flour from the other chamber passes, and I
form a separate outlet M & T for the separate spaces, therefore only
the finest portion of the flour will pass through the part n, while the
coarser will pass out through the part m of the bolt cloth, and each
quality through its respective outlet, the bran passing out separated as
before.
I have thus far represented the bolt cloth as arranged entirely around
the stones, and have also represented the sweeps as being fixed within
the case to the shaft. It will however be readily seen that the bolt cloth
need not extend entirely around, as a portion of the cylinder may be of
solid material, the flour only passing out of the perforated or cloth
portion of the cylinder; and it will also be readily seen that the sweeps
may be detached from and driven independent of the shaft by arranging
a plate, ring, or wheel within the case with projecting arms to act as
sweeps, and communicating power to the said plate from outside the
cylinder.
In Fig. 7 I show a still different modification or arrangement of the
bolt cloth. In this the bolt cloth K is simply placed over the outlet
from the casing. This arrangement serves a good purpose when it is not
desirable to entirely separate the flour from the hulls. In this construc-
tion the grain when ground is thrown against the cloth K, the finest
portion of which will pass through and escape at the outlet M, while the
coarser portion will escape at another outlet with the hulls or bran, thus
in the same mill producing both meal and flour.
I have thus succeeded in producing a mill of very little enlarged
dimensions which combines within itself both a grinding and bolting
apparatus, an advantage over other mills and bolting apparatus which is
too apparent to require that more be said in explanation. This completes
-the first part of my Invention.
I will now proceed to describe the second part, which is illustrated in

page_text: the following Figures, representing in Fig. 8 a front view, Fig. 9 a
side view, Fig. 10 a vertical central section, Fig. 11 a perspective view
of each of the stones, Fig. 12 the rocker detached, Fig. 13 a sectional
view showing the manner of attaching the hopper.
A is the runner husk or casing; B, the discharge spout, one half of
which is cast upon the said casing; C is the supporting frame attached
or made a part of the casing by means of the arms D, which extend from
the said frame C to the casing A and in the said frame C at E, and in
the casing A at F is formed a bearing for the shaft G, and upon the
casing A are formed two sockets H, H, for the hopper, all in one and
the same piece. Heretofore the framè has been made in several parts,
all fitted and secured together and to the casing by means of bolts, and
the hopper connections have also been formed separate and attached by
bolts for the purpose more fully hereafter shown, but in this Invention
they are all cast solidly together, thereby avoiding the expense of bolting
and fitting.
A is the bed stone case, having formed upon its outer surface a
feeding spout B₁ and chamber C', and a bearing E for the shaft,
and also the other half of the discharge spout B, all in one and the
same piece, thus avoiding the bolting and fitting heretofore required.
The two parts of the case A and A' are fitted together and secured by
bolts D', thus forming a complete casing, and the bearings of the mill
in but two parts, whereby a large portion of the expense of construction
heretofore required is avoided. Within the casing A and upon the
shaft G is arranged the runner plate or bed I, see Fig. 10. The runner
stone J is constructed in the usual manner for millstones, but upon the
edge of the stones and centrally I place a metallic flange or band L,
see Fig. 4, the two surfaces of the stone being formed parallel to each
other, the flange L when laid upon the plate I, as in Fig. 10, will
present the grinding surface of the stone the same whichever of the two
surfaces are presented, the bearing of the stone being upon the flange,
therefore when one of the surfaces becomes worn the stone may be easily
reversed, the flange presenting it in proper position without other adjust-
ment, and by means of the said flange I secure the stone to the runner
plate I by screws 1, as seen in Fig. 10, a sufficient number of screws
being employed to firmly secure the stone to the plate. It is necessary
that the stones be always secured in the same position in order that the
balance of the runner stone be maintained, and that the meeting surfaces

page_text: Sixth. Fitting the hopper N into the sockets H, in the manner
described, when the said sockets are a part of one of the husks of
the mill.
Seventh. The rocket P pivoted to the husk and so as to be operated
by an eccentric or cam S on the pulley or shaft, substantially as and for
the purpose specified.
Eighth. A double-faced stone provided on its edge with a central
flange L so as to be set and adjusted substantially as and for the purpose
specified.
Ninth. In combination with the runner plate or bed stone husk,
providing the stones or either of them with a flange L, so as to be secured
by means of said flange L, substantially as and for the purpose
specified.
In witness whereof, I, the said Edward Harrison, have hereunto
set my hand and seal, this 2nd day of April, in the year of
our Lord 1869.
DD HADDISON
ARD HARRISON. (1.S.)
EDWARD