22 



TEENCHING AND SUBSOILING 



Fig. 3. Beauquesne's Horse-gin. 



lowered, on the contrary, it throws the drum into gear, and 

 the horses yoked to the pole B, in their circular motion wind 

 the cahle on the drum. The machine increases the draught 

 ten times. 



The cahle is made of steel wire. It is about 274 yards 

 long, and generally Ool to 0-55 inch in diameter. 



The fixed pulley is a shive 

 supported by a wooden frame- 

 work, through which passes 

 the axle (Fig. 4). A length 

 of chain, ended by a large link, 

 allows the frame to be fixed to 

 another chain, the extremities 

 of which are secured to two 

 anchors deeply buried in the 

 ground. By this process the 

 pulley may easily be displaced 

 on the ground, by allowing the 

 terminal link of the small 

 chain to slide along the large 

 one without removing the 



Ffc. 4.-Fixed Pulley. anchors. 



Working. Under one of the beams of the frame of the 

 capstan, an axle is attached by which the machine is fixed 

 on wheels, to facilitate travelling it from one place to 

 another. Two excavations are made in the ground for the 



