Matt-rid I N in UulL 61 



? of conveyor approaches the apron type prf- 

 isly dcs is also very common to 



attach r: <> a belt instead of a chain for 



a vertical 1 -s are carried on chains 



for heavy, slow work and on belts for lighter and 

 faster moving R Illustrations of both apron 



and bucket conveyors will be found facing page 60. 



Belt Conveyors. The belt conveyor is usually 

 made of impregnated canvas belt, faced with rub- 

 ber. They vary in width from twelve to f 

 inches and may be used to transport material for 

 mccs as great as 1000 feet. To increase the 

 carrying capacity, the loaded or upper run of the 

 belt is troughed. To one who is not familiar with 

 these rubber belts, their wearing qualities are re- 

 markable. Rubber will wear longer under these 

 conditions than steel would. The power required 

 is comparatively small; in fact, if the belt dis- 

 charges down grade, it can be made to run itself 

 by the weight of the descending material. Belt 

 conveyors will transport any solid material, light 

 or heavy, which will not stick to the belt, and 

 can be used on inclines up to 20. The material 

 to be carric 1 be slid onto the belt from an 



incline in the direction in which the belt is run- 

 ning. This is important, because if this is done, 

 the material will vomc to rest on the belt without 

 wear. If it is dropped vertically or against the 

 motion of the belt, there is heavy wear and a 

 shortening of the life of the belt. Such belts 

 he driven from either end, but are usualh 

 driven from the discharge end. Thcv may be 



