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APPLICATION OF THE MACHINES. [Chap. 10.

killed; there is no time lost in doing it, and they are re-gularly mixed with the flour. There is a sliding boardset slanting, to guide the middlings over the conveyer,that the miller may take only such part, for grindingover, as he shall judge fit; a little regulating board standsbetween the tail flour and middlings, to guide more orless into the stones, or elevator.

The light grains of wheat, screenings, &c., after beingblown by the fan 13, fall into the screenings garner 32;the chaff is driven farther on, and settles in the chaff-room 33; the greater part of the dust will be carried outwith the wind through the wall. For the theory of fan-ning wheat, see Art. 83.*

To clean the Screenings.

Draw the little gate 34, and let them into the elevatorat 4, to be elevated into garner 10; then draw gate 10,and shut 11 and 34, and let them pass through the roll-ing screen 12 and fan 13, and as they fall at 14, guidethem down a spout (shown by dotted lines) into the ele-vator at 4, and elevate them into the screen-hopper 11;then draw gate 11, shut 10, and let them take the samecourse over again, and return into the garner 10, &c. asoften as necessary; when cleaned, guide them into thestones to be ground.

The screenings of the screenings are now in garner32, which may be cleaned as before, and an inferior qua-lity of meal made out of them.

By these means the wheat may be effectually separatedfrom the seed of weeds, &c., and these saved for food forcattle.

This completes the whole process from the wagon tothe wagon again, without manual labour, except in pack-ing the flour and rolling it in.

* The bolting reels may all be set in a line connected by jointed gudgeons, sup-ported by bearers. The meal, as it leaves the tail of one reel, may be introducedinto the bead of the other, by an elevator bucket, fixed on the head of the reel,open at the side next the centre, so that it will dip up the meal, and, as it passesover the centre, drop it in. This improvement was made by Mr. Jonathan Elli-cott; and by it, in many cases, many wheels and shafts, and much room may besaved.