. Journal. this description also applied mthe same manner and degree to the great varietyof technical mixings which were used in a rubberfactory. (—In Whitbys experiments, mwhich the vulcanisation were carried out bySchidrowitz. 100 parts o{ i-ubber to 8 pa-rtB ofsulphur was used ; in o\ir researches 90 parts olrubber to 10 parts of sulphur employed iv allthe experiments so far published.) Vol. XXXV., .\] EATON & GRANTHAM—VARUBILITV of RUUBKR IN TECHNICAL MIXINGS. 1047 Iii the oxpciiments described here, we hope tosliow that wliat applies to a theoretical mixing(as Steven
. Journal. this description also applied mthe same manner and degree to the great varietyof technical mixings which were used in a rubberfactory. (—In Whitbys experiments, mwhich the vulcanisation were carried out bySchidrowitz. 100 parts o{ i-ubber to 8 pa-rtB ofsulphur was used ; in o\ir researches 90 parts olrubber to 10 parts of sulphur employed iv allthe experiments so far published.) Vol. XXXV., .\] EATON & GRANTHAM—VARUBILITV of RUUBKR IN TECHNICAL MIXINGS. 1047 Iii the oxpciiments described here, we hope tosliow that wliat applies to a theoretical mixing(as Stevens doscrihes an S^,, or 10% sulphurmixing) also applies to smaller proportions ofsulphur in i-uhber mixings and also to mixingscontaining, in addition to sidphur, mineral sub-stances such as oxide of zinc and oxide of mag-nesium, a result which would be expected from thenature of the vulcanisation process. That atheoretical mixing of 8% or 10Jo of sulphurwould apply in the .same manner or to the same. degree to rubber mixings containing mineral in-gredients, etc., has not, so far as we are aware,been assumed, nor is it pivbable that it would doso, although the differences in rate of cure, whichSchidrowitz and Goldsbrough and independentlyour own researches have shown to be marked in thecase of plantation Para rubber (due to methods ofcoagulation and prepai-ation), still exist, whatevermixing be employed, provided such mixings do notcontain powerful accelerators such as oxide oflead, which, as would be expected in view of thetheory put forward by us as to the cause of varia-bility in rate of cure, would obscure the issue. Experimental. For details of technique, refei-ence should, bemade to our first Comnuaication. VvilcanisationExperiments on Plantation Para Rubber.—TheCause of Variability (this J., , 34, 989). used as the control after adjusting to correspondwith the temperature of 110° C.) The samples were vulcanised in moidds, asdescribed in the paper to which refe
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