�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

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