A. M. Mayer — Physical Properties of Vulcanite. 57 



which, are all negative, show the increasing rate of expansion 

 of the vulcanite over the mercury. These differences which 

 form the apparent expansion (contraction) of the mercury in 

 the ebonite thermometer are given in the accompanying curve, 

 from which one may take the gradually increasing length of 

 degrees on such a thermometric scale, which reads downward. 

 The units of abscissse, read from right to left, are 10° C, the 

 units of ordinates, read downward, are each '0002. 











Fig. of Curve. 







































































































































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