OR SUBSOILING PLANT. 



.77 



In the firs tease, a 

 beam N (Fig. 38), 

 8ft. 6in. x4ft.:im.in 

 section, and 3ft. Sin. 

 at least in length, 

 is buried in a trench 

 12 inches deep ; 

 behind this beam, 

 and in a slanting 

 direction, two pegs 

 p are driven into 

 the ground, in such 

 a manner that the 

 points be further 



apart than the Fig. 38. -Anchoring Beam. 



heads, a gudgeon B passed through a ring of the chain n y 

 rests behind the pegs, the traction of the chain being ren- 

 dered even on the beam N. 



If we study Plate I. again, we see that when working, the 

 capstan A exerts a traction on g in the direction of arrow 2, 

 equal to the sum of the resistances of the plough C and the 

 cable t. This traction is divided on the two pieces g n and 

 g n' of the chain n- n', the result being a tendency to bring 

 the anchors N' and N' closer together, exerting a com- 

 pressing action on the soil, which under these conditions 

 offers great resistance. 



Certain implement makers replace the beam by a wrought- 

 iron plate, the principle remaining the same. 



Guyot now uses 

 the anchor shown in 

 Fig. 39, consisting 

 of a steel ring A 

 lying flat on the 

 ground, and kept in 

 place by four pegs 

 P strapped on the 

 ring at B, the trac- 

 tion chain C passes 

 over the ring. With 



Fig. 39. Guyot's Anchor. . , . 



this arrangement 



the pegs blocked by the straps cannot lean, and offer great 

 resistance to the tractiony without requiring the ramming of 

 the soil necessary when using a beam. (Price of anchors and 



