THE ELECTROMOTIVE PHENOMENA 



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phasic character of the action current in the more 

 rapidly contracting skeletal muscle is made visible, 

 and the form of the action current wave recorded. 

 Before the capillary electrometer was used for 



Fig. 54. Scheme of differential rheotome. 



this purpose, the differential rheotome of Bern- 

 stein was employed. This celebrated invention 

 consists of a wheel which revolves at uniform 

 speed and carries contacts by which the primary 

 circuit of an inductorium and a galvanometer 



