YOUNG MILL-WRIGHT and MILLER'S GUIDE,
by Oliver Evans
Fig. 16, Plate VII, is a representation of a small grist-mill, so constructed
that the grist being put into the hppper, it will be ground and bolted and
returned into the bags again.
The grain is emptied into a hopper at A, and as it is ground it runs into
the elevator at B, and is elevated and let run into the bolting hopper down
a broad spout at C, and, as bolted, it fallls into the bags at d. The chest
is made to come to a point like a funnel, and a division make to seperate
the fine from the coarse, if wanted, and a bag put under each part; on the
top of this division is set a regulating board on a joint, as x, by which
the fine and coarse can be regulated at pleasure.
If the bran require to be ground over, (as it oftem does,) it is made to
fall into a box over the hopper, and by drawing the little gate b, it may
be let into the hopper as soon as the grain is all ground, and as it is
bolted the second time, it is let run into the bag by shitting the gate
b, and drawing the gate c.
If the grain be put into the hopper F, then as it is ground it falls into
the drill, which draws it into the elevator at B, and it ascends as before.
To keep the different grists seperate;-when the miller see the first grist
fall into the elevator, he shuts the gate B or d, and gives time for it
all to get into the bolting reeel; he then stops the knocking of the shoe
by pulling the shoe line, which hangs over the pulleys pp, from the shoe
to near his hand, making it fast to a peg; he then draws the gate B or d,
and lets the second grist into the elevator, to fall into the shoe or bolting
hopper, giving time for the first grist to be all in the bags, and the bags
of the second grist to be put in their places; he then unhitches the line
from the peg, and lets the shoe knock again; and begins to bolt the second
If he does not choose to let the meal run immediately into the bags, he
may have a box made with feet, to stand in the place of the bags for the
meal to fast as it is bolted, and mixed as desired; and as soon as the first
parcel is bolted, the little gates at the mouth of the bags may be shut,
while the meal is filled out of the box, and the second grist be bolting.
The advantages of this improvement on a grist-mill are:
1. It saves the labour of hoisting, spreading, and cooling the meal, and
of carrying up the bran to be ground over, sweeping the chest, and filling
up the bags.
2. It does all with great despatch, and little waste, without having to
stop the stones or bolting-reel, to keep the grist seperate, and the bolting
is finished almost as soon as the grinding; therefore, the owner will be
the less time detained.
The chests and spouts shold be made steep, to prevent the meal from lodging
in them; so that the miller, by striking the bottom of the chest, will shake
out all the meal.
The elevator and drill should be so made as to clean out at one revolution.
The drill might have a brush or two, instead of rakes, which would sweep
the case clean at a revolution; and the shoe of the bolting hopper should
be short and steep, so that it will clean out rapidly.
The same machinery may be used for merchant-work, by having a crane-spout
at C; or a small gate, to turn the meal into the hopper-boy that tends the
A mill, thus constructed, might grind grists in the day-time, and merchant-work
A Drill is preferable to a conveyor for grist-mills, because it may be cleaned
out much sooner and better. The lower pulley of the elevator is twice as
large in diameter as the pulleys of the drill; the lower pulley of the elevator,
and one pulley of the drill; are on the same shaft, close together; the
elevator moves the drill, and the pulley of the drill being smallest, gives
room for the meal to fall into the buckets of the elevator.
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