/ 148 Description of Mr. Evans's ANG/l[March

gt the end next the elevator 3; turn the Shaft the way in which it 15 to go when at work, Sn at the distance of 1 1-2 inch, Set a fight on the next Side, in the Same oblique manner as the other; and 1: 90 on to turn the Shaft, and to insert a flight at eve"yY E12 inch distance, till the Spiral line be com- pleted to the 58 end of the SHE Then the spire of the Screw wil] appear, at first view, to be turned the wropg way, he flights Standing across the Spiral line.

Besides the conveying flights, above mentioned, balf their number of other fights are to be Set with 7 broad-Side foremost. Thee are called /iftäing-flights. Their use is, to hit ihe meal from one Side of the shaft, and let it fall through the air to the other Side. This is of great use in cooling the meal.

Of the DESCENDER.

When there is not zuficient descent from the elevator to the hopper-boy for the meal to run, the descender becomes DEeCeSSArTY, This is a broad Strap of thin canvas or linen, Set to revolve round two pullies, hung on nice pivots, in a trough or case, one end of which ts Jower than the other; So thar the weight of the metal Jet fall from the elevator on ie upper Side of the Strap, near the higher pully, Sets the Strap in mo» tion, by which the meal is diScharged at the lower pully into be hopper-boy. Here a small bucket, extending across the Strap, 1s uSed, for the purpose of bringing up the waste meal out of the case.

Tbe pullies ought to be one foot in length; nine inches diameter at tbe ends, and ten in the middle: the Strap twelve inches wide;-and the trough fourteen(ach wide, and fit- teen deep. As this machine will Seldom be NCeCCSSATY, NO re= Piesentation of it 13 given In the plate.

Of ihe HoPpER-Boy.

Length of the arms, 14 feet. The width to be 7 inches atthe centre, and 5 at the ends; their thickness 2 inches and a half, the fore Side Sloping upwards. The flights are to be Set four inches asunder; their inclipation to be about 2 1-4 inches for five in length near the centre; 1 inch in 5 at the ends, and 2 inches in depth, that in moving round, they may GES the meal towards the centre. OQne Sweeper must be Place d at each extremity of the arm, and one over the hop- per."The MPE Shaft to be four feet and a half, made round, that the arm may have libe rly to rise about three feet. Let the pully tor the balance be 8 inches in diameter. Mo-

tion, 4 revolutions in a minute. Several uses to wich the ELEVATOR MaYy be applied, beides those represented in the Plate, viz.

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To elevate wheat, or any other grain, from Shallops inte