700 



Fig. 3 has been taken 15 minutes after Fig. 2. The width of the 

 R-oscilJation has still increased very much ^). The T-oscillation has 

 now become strongly negative and the line of connection between 



1) The time has not been reproduced in this phologram, but tlie velocity of the 

 fall of the plate was the sanie as in the former pholograms. 



