MmicJiestcr Memoirs, Vol. liv. (1910), No. 13. 11 



and Fig. 3 the result of plotting the galvanometer deflec- 

 tions against current. The straight line obtained shows 

 that the formula 2 is verified. 



It is important toconfirm the result of this approximate 

 method by diminishing the time of opening the circuit. 

 This was done by arranging a compensation method with 

 a galvanometer, G, for a zero instrument (see Fig. 4). 



H\eLHTiOH S£Twe£N LyR«£MT and r^LARlSATloN 



70 



T 



to 



Q 



50 



oooso 



By means of a rotating commutator, C, of a secohmmeter 

 driven by a small electric motor M, the interval of 

 opening the circuit was reduced to less than y^o^h of 

 a second. It was, however, soon discovered that the 

 rapid intermission of the current caused extreme dis- 

 comfort to the subject, a state of rigidity being soon 

 established. The maximum current attained has been 



