112 PARA RUBBER. 



mass by hand should first be put through without any weight. 

 A little weight should be applied the second time through, and 

 additional weight the third time, which will probably complete 

 the process. A little practice will determine the exact amount 

 of rolling necessary. Care should be taken not to roll too much, 

 as excessive rolling, or squeezing, by closing the pores, retards 

 the drying. 



" Worm Rubber. To make ' worm ' rubber, cut the sheets into 



FIG. 20. Messrs Walker's "Worm" Rubber Cutting Machine, used in the 

 Michie-Golledge Curing Process. 



very thin strips, about ii inch to 2 inches long and $ inch in 

 width." 



Messrs Walker & Co. have recently placed on the market a 

 " worm " rubber cutting machine (Fig. 20), by the aid of which 

 they claim that 120 Ibs. of dry rubber can be cut up per 

 hour. 



Drying. Put the rubber where a fan can draw dry air (heated 

 air of high temperature should not be used) through it. In about 

 twenty-four hours the rubber will be dry, and may then be heaped 



