hur. chines. material or its manufacture, endeavored to keep up the den- Sheets of pure rubber or of rubber-coated fabric are the sity of the products at the expense of their other qualities. Another method consists in exposing the object to be vul- canized in a bath of melted sulphur at about 125°… … other manufactured objects, At first, caoutchouc was manufac- The discovery of the influence of tured and used in its normal state. It sulphur on normal rubber was due to was cut into strips, and threads, and chance, which was also, for a long time, the only guide of vulcanized threads, clothing,…
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