2 The Thbrefhing Machine.[July

ſimilar wheel, at the end of a ſimilar roller, carries it alſo‘round, with the /ame velocity, but in an oppoſite diretion. The grooves of both rollers, thus turning inwards, ſeize, with irre- ſiſtible force, and hurry forward whatever is preſented to their graſp. A ſloping board(the ſituation of which is marked at G) E attiched ſolas to almoſt touch theron rolless On ENES feeder of the machine ſpreads(as equally as poſkble) the corn; which, with a uniform pace, is thus ſubmitted to the repeated blows of the beaters, An eaſy calculation demonſtrates that, for every turn of the horſe-wheel, the wooden cylinder(called che drum) muſt turn no leſs than 66 times(about 25 miles per hour), each of which turns gives ſix blows to the corn.‘The thickneſs of the iron- rollers is ſo contrived, that three frokes are given to each inch of any thing that paſſes through them.— Thus it is next to impoſible that an ear of corn can paſs with- out a blow, though it ſhould be offered fide-ways; and the grooves in the rollers hold the raw ſo faſt that a very con- fiderable reſiſtance is oppoſed to the blow of the beaters, by the corn.|

The diameter of the drum, in this two-horſe Machine, is 3 feet 2 inches; the length of the beaters, 3 feet 7 inches. In à four-horſe Machine, the diameter of the drum is 4 feets length of beaters, 4 feet 6 inches. The price of a four-horſe Threſhing Machine, 100 guineas;—of a two-horſe ditto, 60 guineas. The firſt will threſh out about zo quarters, in ten hours—the other, about 12 or 14. If a ſingle horſe be uſed in the two-horſe Machine, the feeder muſt offer the corn in leſs quantity, and the horſe’s labour will not be over violent.

A Threſhing Machine, on a fill ſmaller ſcale, is conſtructed to work by two men. If A, B, C, of the fg. 1 and 2, were ſuppoſed removed, and a heavy fly-wheel hung on in the place of the pinion-wheel D, an accurate idea may be immediately formed of this ſmall Machine. Tt has handles in the axis of an iron-wheel, whoſe cogs, ating on a ſmaller wheel(alſo at D) impart the requiſite rapidity of motion to the drum FE. be great convenience of this Machine is, that its moderate ſize and iimple apparatus ſuffer it to be removed. in a cart, without much trouble; ſo that two or three farmers may be partners in the expence of it, uſing it- alternately; or it may be ſhifced to dif- ferent yards, on the ſame farm. The inconvenience 1s, that it employs two men to do a poney’s, or an aſſe’s work; thus coſting about four times as much to work it; about a penny a2 buſhel more for threſhing, We were minute in our enquiries, whether it was impoſible to apply a horſe-wheel to this handy Machine, which, in that caſe, would ſoon become univerſal; bur the want of ſufficient ſtability(in a moveable Machine) to bear the adion‘of a horſe, was alledged. As a fixed Machine, a proportionable horſe-wheel might, of courſe; be applied to it,