hur. chines. material or its manufacture, endeavored to keep up the den- Another method consists in exposing the object to be vul- Sheets of pure rubber or of rubber-coated fabric are the sity of the products at the expense of their other qualities. canized in a bath of melted sulphur at about 125°… … other manufactured objects. At first, caoutchouc was manufac- GATHERING AND DRYING RUBBER IN PARA, 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…
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![An illustration from Pars I. des berühmten italiänische[n] Ritters Caesaris Ripae, allerley Künsten und Wissenschafften dienlicher Sinnbildern und Gedancken : welchen jedesmahlen eine hierzu taugliche Historia oder Gleichnis beÿgefüget (1758)](https://img.insideoutlibrary.com/img/200/ia-parsidesberuhmte00ripa-24-17.webp)
