RUBBER PLANTING 161 



roller illustrated shows all the essential features of 

 heavier machines which are driven by belts or shafting. 

 The distance between the rollers is adjustable by special 

 screws. A spray of water plays over the rollers, and a 

 strainer is placed below the machine in order to collect 

 any fragments of rubber which may be torn off in the 



Fig. 22. Hand washing machine. 



washing process. [Three types of machine, differing 

 somewhat in detail, are employed for different purposes, 

 namely sheeting, creping and macerating respectively. 



Sheeting machines have smooth rollers which revolve 

 at an equal rate of speed. The rubber sheets are simply 

 passed two or three times between the rollers under a 



L II 



