Page:Willich, A. F. M. - The Domestic Encyclopædia (Vol. 2, 1802).djvu/466

434&#93; 434] H A R follow another in the same track ; whereas-, in the common harrows, one half of the teeth run in the same course. In the Qth volume of the Let- ters and Papers of the Bath and West of England Society, there is a description of a pair of harrows and of a drag, or heavy harrow, invented by Mr. H. Wynne. His implements are constructed in such a manner, that each pin makes a separate track, and that the inter- vals between those tracks are all equal ; so that the entire ground, over which the harrow passes at one time, will be marked with lines three inches apart. The pair of harrows is seven feet six inches broad; and the inventor asserts, that the same horses will, by means of it, work one fourth more ground, and perform such labour much better, than by any other harrow. Mr. Wynne's imple- ment is stated to possess this far- ther advantage, that when the pins or teeth sink into the earth, the posts being nearly parallel to the line of draught, admit all roots, stones,, and other obstructions to pass freely between them, and also beneath the rails by which they are connected. And, as -the hinge is within the tine, when the har- row is drawn up and down ridges, it accommodates itself to the shape of the groundj the joint rising when the harrow is on the top of a ridge, and sinking when it is in the furrow. The drag, or heavy harrow, likewise invented by Mr. Wynne, is constructed without a joint, and will work a piece of land six feet three inches in breadth, leaving intervals of five inches between the tracks. The principle is simi- lar to that on wluch the iniplc- MAR merits just described are formed and which, the inventor says, is applicable to harrows qf any size ; as the intervals between the tracks may be varied at pleasure, the re- gularity being atill preserved. — • The spikes or teeth here employed are made of square iron, pointed and bent forward diagonally ; they are fixed in such a direction, that the line of the track may pass through their angles. A patent was granted in May or June, 1801, to a Mr. Wilde, for a harrow on a new plan. Mis in- vention is intended to obviate the inconveniencies attending the com- mon harrows : from the ingenuity and simplicity of its construction, it appears to merit attention. The set -of harrows, when put together for work, consists of tour, which are constructed in the usual man- ner, and with the. usual number of tines. These are placed nearly parallel to each other, and are combined by means of three iron links, which are. moveable where they are joined to the harrow : the centre link is fitted in an oblique direction, and is longer than the other two, which are set straight. All the links, however, are placed loosely, in order that the implement, when joined toge- ther, may have a little play-room. This ingenious harrow is fastened to the bearingrlar, to which the traces are affixed, by means of an iron pin that is attached to the chain-hook, passing through holes made at different distances in the bar, so as exactly to give the re- quisite direction to the harrow.— Thus, the equal course of the. iiu* plement is secured ; and the work is more uniformly performed, audi with a greater degree of regularity. Mr. WllDg, makes harrows tor Jh-c-