13805.]'Description of Mr. Evans's Mill. 147

Shows the manner in which it is joined to the pullies, at each zide of the elevator,

The hopper-boy is an upright Shaft, Set in motion and car- xying round with it an horizontal piece called the arms, Set with flights, in the under Side, in an oblique direction; S0 constructed as to Spread the mealthinly over the foor, to cool; and, at the game üme, to gather it into the boulting-hopper. These arms are balanced by a weight, hung to a rope pasSing over a puliy, atthe head ofthe upright Shaft; S0 that It plays lightiy on the medal, and will rise or fall, as the heap Increases or decreases. See it in ig. Lover Q Q. Pig, 4 is a perspective view, of the under Side of the arms of the ALvpper-b0y, with Nights complete. The dotted lines Show the track of the flights of one arm; those of the other following, and tracking be- tween them. AA are the sSweepers, These carry the meal round in a ring, trailing it regularly all the way, the flights drawing it to the centre, as already mentioned. BB are the Sweepers that drive it into the boulting HOPPE:

Braef p3RBCTIONS for constructing the Several MACHINES« Of the WHEATV-ELEVATOR.

Let the pullies be 17 inches in diameter, 4 inches in thick- ness, and half an inch higher iu the middle than m any other part. The motion about 47 revolutions 10 a minute, which will moye the Strap 200 feet, in the Same time. Tune 8/7ap is to be made of good harness, 4 inches wide; and to be iur- nished witb a bucket, of the Same widtn, 53 inches in length, for every root the strap 15 in length. This elevator will hoist 3,375 bushels in 12 hours,

To prevent the machine from being over loaded, the wheat must be let in at the bottom, to meet the buckets. The cases ought to be a little crooked, to Suit tbe motion of the trap, that the buckets may not touch them in descending.

Of ihe NIEAL-ELEVATOR.

Putllies 16 inches in diameter and 3 1-2 thick, highest in the middle. Buckets the width of the strap; their number in proportion to the work they have to do; il to hoist meal, tail-four and bran, for two. pairs of Stones, put one for every foot. The motion 24 revolutions of 1be pully in a minute, wbich will move the strap about 100 feet. It will dicharge the better if made t9 lean a little.

Of the CONVEYER.

After the description that has already been given of the Conveyer, we need make but few remarks on the manver of gonstrucung it.=The eight-Sided Shaft ought to be 5 inches in diameter: tbe flights 3.iuches long, and 2 1+2 wide. Set the first fight iD an oblique manner, on oue Side oi the Sbalt,