86 MINUTES OF 



On the Construction of a Couch Grass Drag, 



DISSERTATION VIII. 



On the Construction of a Couch Grass Drag, 



Plate VI iP 

 Fig. 1. ' -1*- LATE VI. Fig. 1. Is a profile of the couch grass drag with its appendages. 



A A. repr/?sent the wheels on which it is carried from one field to another, 

 and by which the depth of working is regulated. These wheels, which are ten 

 inches diameter, turn round upontheir axles, and also upon the under end of the 

 upright shank, in imitation of bed castors. 

 ; When the machine is to be used, the wheels are taken out of their present 



situation and reversed, and the machine turned upside down. Then it is ready 

 for travelling any where. 



B. represents the middle beam, to which the horses are fixed, &c. 



C C C C C. represent the coulters fixed in the beams by nuts and screws. 

 They are thirteen inches long below the beams, made of iron, one inch and a half 

 by half an inch square, inclining forwards in the form of a segment of a circle, 

 for the purpose of lifting up the roots of the couch grass to the surface. 



E. the handle for managing the machine, about four feet three inches long. 

 p-j „ Fig. 2. Is a horizontal view of the couch grass drag. 



AAA. represent the mortise holes that receive the shanks of the wheels. 



B. the middle beam, about six feet eight inches long, and five by four inches 

 square, with a coulter hole near B. 



C C. two side beams, which are about six feet nine inches long^ and five by 

 four inches square. 



In these beams are fixed five coulters in each, at six inches distance, right 



