Page:Willich, A. F. M. - The Domestic Encyclopædia (Vol. 2, 1802).djvu/464

4J2] HAR of which we have annexed the fol- lowing representation : ridges be high, and re- quire to be harrowed through their whole length, that object will be effected by Mr. Sandilands' im- plement : as by lengthening the chain (which is commanded by the screw), the harrow, when drawn along, will form an angle down- wards, and thus pass over every part of the curve of the ridge in proportion to its extent ; which, according to his statement, may be mine feet, the distance from A to B ; whereas the whole extent from C to D, is said to be only about Jive feet and a half. When the crowns of the ridges have been suf- ficiently harrowed lengthways, the chain may be shortened by the screw, which forms an angle up- wards : the harrow is then drawn by horses, one on each side of the furrow, which will be completely reduced as well as the sides of the rid ;•• ;. if 1 8 feet in breadth. ]f the barrow is to be drawn across even ground, or high ridges, in such cases, it may, by the aid of the screw, be made horizontal, iO as to work in the manner of a solid harrow without a joint. The teeth of Mr. Sandilands' im- plement are square, and lixed in the usual way", being nine or ten HAR inches below the wood, and of such strength as the land may re- quire. They cut or tear the ground regularly every four inches, with- out clogging, unless at the ex- treme angles, where the teeth are necessarily put somewhat closely tog ther : they may, however, be cleared with the utmost facility, by raising them a little from the ground . The figures 1 , 2, 3 , 4, &c. point out where the twelve teeth on each side of the harrow are placed. Mr. Saxdilands observes, that where a strong brake-harrow is not necessary, by making the teeth shorter or lighter, -IS tines may be obtained, which will tear the ground at every two inches, cover the seed well, and make a fine mould. He farther recommend to construe!: harrows for every purpose , and of every size, on the principle abmfe staled ; as, in such case, no tooth can follow the track of another, and all are kept in constant action. The same gentleman has also- invented another implement, called a IFrack-liarroic, from the speedy mannet in which it coliefts the wrack, or roots of couch-grass,- and other noxious wet ds. Of thi* contrivance the annexed figures re«  present the plan and profile;