Chap. 11.] CONSTRUCTION OP MACHINES. 221

Fig. II. is a perspective view of the conveyer, as itlies in its troughs, at work; and shows the manner inwhich it is joined to the pulleys, at each side of the ele-vator.

Fig. III. exhibits a view of the pulley of the meal ele-vator, as it is supported on each side, with the strap andbuckets descending to be filled.

Fig. IV. is a perspective view of the under side of thearms of the hopper-boy, with flights complete. Thedotted lines show the track of the flights of one arm;those of the other following, and tracking between them.A A are the sweepers. These carry the meal round ina ring, trailing it regularly all the way, the flights draw-ing it to the centre, as already mentioned. B B are thesweepers that drive it into the bolting hoppers.

Fig. V. is a perspective view of the bucket of thewheat-elevator; and shows the manner in which it is fas-tened, by a broad piece of leather, which passes throughand under the elevator-strap, and is nailed to the sideswith little tacks.

CHAPTER XI.

OF THE CONSTRUCTION OF THE SEVERAL MACHINES.

ARTICLE 95.

OF THE WHEAT ELEVATOR.

To construct a wheat-elevator, first determine howmany bushels it should hoist in an hour, and where itshall be set, so as, if possible, to answer all the followingpurposes:—

1. To elevate the grain from a wagon or ship.

2. From the different garners into which it may bestored.

3. If it be a two-story mill? to hoist the wheat fromthe tail of the fan, as it is cleaned, to a garner over thestones.

4. To hoist the screenings, to clean them several times.