464 



Mr. Morris Owen on 



In fig. 2, curves L, II., III. represent the charges produced 

 on the same specimen of ebonite by friction with slate under 

 the smallest, middle, and greatest pressures respectively. 



Fi* 2. 



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Measurements made with specimens of different widths 

 showed that the charge produced by a given amount of fric- 

 tional work was almost exactly proportional to the width of 

 the specimen, except in the case of very small amounts of 

 work. 



Fig. 3. 



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In fig. 3 the readings obtained with the various glass and 



