Above: At the viil- 

 canizers. No cook ever 

 needed to know more 

 about his job than must 

 the tire vulcanizer 

 about his. Rubber can 

 easily be overcured, 

 undercured, blistered, 

 hardened, and rendered 

 in bad humor generally 



Above: Trimmed- 

 away holes. Back of 

 these, and inside the 

 tire, go the pieces of 

 sheet rubber (raw-gum 

 side toward operator) 

 that serve as a backing 

 and reinforcement of 

 the rubber-gum filler 

 which is used. 



At left : Vulcanizing 

 inner tubes. It takes 

 only a relatively few 

 minutes to cure inner 

 tubes. The work is 

 done on a flat plate 

 heated by steam and 

 equipped with short, 

 hinged, clamping levers 



.S41 



