Journal . a & ? s fc 9 10 ir la ImU , I I I I I I I I I I I G. With this apparatus small vulcanised rubbersamples, varying from hard vulcanite t« softpure qualities, may be rapidly and eflectivelyreduced to a line state of division. For the harderqualities the low speed gives tlie more satisfactoryresults, wliile when dealing with soft material abetter result is obtained liy increasing the rate ofrevolution. As a, rise in temperature takes place during theoperation and the resultant material is in a fljnely- • Makers : Messrs. Alex. Mathieson and Sons, Ltil., Saracen ToolWorks Glasgow. divided
Journal . a & ? s fc 9 10 ir la ImU , I I I I I I I I I I I G. With this apparatus small vulcanised rubbersamples, varying from hard vulcanite t« softpure qualities, may be rapidly and eflectivelyreduced to a line state of division. For the harderqualities the low speed gives tlie more satisfactoryresults, wliile when dealing with soft material abetter result is obtained liy increasing the rate ofrevolution. As a, rise in temperature takes place during theoperation and the resultant material is in a fljnely- • Makers : Messrs. Alex. Mathieson and Sons, Ltil., Saracen ToolWorks Glasgow. divided condition, it was thought desirable toascertain whether any alteration took place inthe acetone extract, due to oxidation of the rubberor volatihsation of siUphur. Experiments havebeen made to test this point, and the compositionof the rubber was found to be unaltered by thetreatment. With the material in a finely-divided conditionthere is no difficulty in obtaining a representativesample for analysis. The acetone extraction is rendered more com-plete, a
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
