SCIENCE OF THRESHING. 65 



when of the best grade is very economical, as its first 

 cost is less than that of the best grades of leather. 

 Chain or link belting is sometimes used and in some 

 places is preferable to any other. It never slips or 

 runs off, and does not become unlaced. When link 

 belting is used it should not be run when too tight as 

 it causes a trembling or jarring vibration as each link 

 passes the sprocket. 



LACING A BELT. 



There is a right and a wrong way to lace a belt. 

 The ends to be joined should first be cut squarely 



across. A belt punch to make the holes for the 

 lacings should form an aperture big enough for the 

 lacing to pass freely without straining the fibre of the 

 leather; otherwise there is a tendency to tear out, and 



