576 Description of a Machine for cutting Thistles,[Dec.

would 5000 be Stopped, and our lands and high-roads freed from those noxious plants which are pot only a disgrace to a neighbourhood, but highly mischievous to agriculture.

Reference to the Engraving of Mr. R1NGRoSE's Thistle

or TMWeed-cutter.

F16. 1. Geowetrical plan of the machine.

A. The whipple, fastened to the two ground sills.

B. Ihe double chain or rope, two feet eight inches long, fastened to the whinple and the fore ends of the gills.;

CC, Two scythes, three feet eight inches loug from point ts point, and four inches and three quarters broad at their fore ends, which meet in a point between the double chain or rope, and are fastened to the ills with ſour Screws; their poihts or Sharp ends extending three feet one inch from the joint of the fore-hinge,

DD, Two round iron staples, driven into the ſore endof the ills, to which the double chain is ſastened.

EE, Two iron hinges fastened with Screws to the upper zurface of the ills.

FF, Two braces, two feet five inches long, 1wo inches broad, and two inches thick at their back ends, and one inch at their fore ends, where they are dovetailed, and let in even with the upper surface of the ills, and fastened thereto with Screws."There 18 an aperture or mortise, Sawed into the fore ends of be braces, to receive the back edges of the Scythes, which are ſastened thereto with iron pins,

GG, Two ground Ssills, four fcet three inches long, four inches broad, and three inches thick: these Sills are paralle] to each other, and are connected with two Strong iron hinges, screwed tv their upper Surface; the fore ends of the sills are cut up a little Slanting from their under Sides, as represented in Pig2'2.

"This instrument by means of the double Sills and: hinges may be used with both the scythes horizontal, or with one or both Set t0 any degree of elevation, by which means ai7y un- evenness of the ground, or obstruction on its Surface, Such as Stones, roots, ant hills,&c- may be easily avoided; by this contrivance also, the Scythes may with great facility be put into a proper position to be whetted when there is oCCasION.

HH, Two arms eight inches and a halt long, trom the Houlder of their tenons to their outer ends, four inches broad, and two inches and three quarters thick, mortised at right an-

Jes into the Sides of the sil!s, anc even with its upper Surface,

11, Two bandles Six feet ihree inches long, and four inches

Square at the bottow: with bese handles the instrument 13