( 524 ) 



I have then allowed the Poerwakarta-current to be registered at the 

 same time as the Cheribon-current and I have found a complete 

 correspondence between them for vibrations of a duration from 0.8 

 to 15.5 minutes. 



Not before the last months of the registering-period have I extended 

 the investigations to the lines to Semarang and Soerabaja and to 

 my surprise I found a pretty great deviation from the circumstances 

 which appear on the lines Cheribon and Anjer. 



Semarang — Anjer. 



Soerabaja — Anjer. 



2.17 



2.87 

 3.27 

 4.71 

 7.16 



20 

 20 

 20 

 20 

 7 

 87 



So the influence of the duration on the amplitude of the earth- 

 current is here much greater for the Semarang- and Soerabaja- 

 current than for the Anjer-current. 



It is remarkable that here too the increase of the influence with 

 the duration takes place about according to i^'/r- 



With respect to the first value for t =: 0.33 min., respect. 0.37 

 minutes duration we get : 



