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THE

AGRICULTURAL MAGAZINE:

SS

No. XLV.] ABRIL, 1803. EV od:.VEi le

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DESCRIPTION OF A MACHINE FOR RAISING WATER A FEW FEET HIGH BY THE PQWER OF THE WIND, FOR, THE PURPOSE OF DRAINING MORASSES, OR OF WATERING LANDS ON A HIGHER LEVEL.

Copied by Permission, from Dr. Darwin’s Phytologia.

F(‘SHE Plate aceompanying this Number, represents a Windinill sail, placed horizontally like that of a Smoak- jack, surrounded by an octagon tower; the diverging rays of this tower, a b, ab, may. consist of two-inch deals only, if on a small scale, or of brick-work, if on a lar gerone. These up- right pillars are connected together by“oblique horizontal boards asshewnat A B, by which boards placed horizontally from pillar to pillar, in respect to their length, buf at an angle of about 45 degrees in respect to their breadth, so as to form a complete octagon including the horizontal eereey sail near the top of its the wind as it strikes against any of them, from whatever quarter it comes, is bent upwards and then strikes s against the horizontal wind-sail. These borizontal boards, which form the sides of the octagon, may either be fixedan their situation, wr be made to turn upon an axis lit- tle below their centres of gravity, so as to close themselves on that side of the octagon tower most distant from the wind.

It may be supposed that the wind thus reflected would lose

i considerably of its power before it strikes on the wind-sail, but on fixing a model of such a machine on the arm of*a jong owe. lever, with proper machinery to count the revolutions

f the wind bain when thus included in a tower and moving aeeonctonc aod then when moved vertically as it was whirled on the arm of the| 5 er with the same velocity, it was found on many trials by Mr, Edgeworth, of Edgeworth Town, in Ireland, and by myself, that the wind by being thus re- verted upwards by a fixed planed board did not seem to lose any of its power. And asthe height of the tower may be made twice as great as the diameter of the sail, there is reason to conelude that the power of this lyorianntal wind-sail may be considerably greater, than if the same sail was placed near ly vertically oppos Sec to the wind in the usual manner.

At the bottom of the-shaft of the wind-sail is placed a cen- trifugal pamy» with two arms at C D, which has been describ- ed in mechanical authors. It consists simply of an upright bored trunk, or cylinder of lead, with two opposite arms with

4g. Mag.} ol. 8.