72 



The earth-current was observed during 1882—83 every 

 hour and during Jours termes" every 5 minute. In the 

 year 1883—84 the observations were made only three ti- 

 times each day but as before every 5 minute in , .jours ter- 

 mes" the l:st and the 15 every month. Gertain days the 

 observations were made in the evening for every half mi- 

 nute during two hours. 



Special researches were made, among others, on the 

 earth-currents in circuits which were advanced the one be- 

 fore the other half the distance between them, in order to 

 search out if the phenomenon remained the same when the 

 points, between which the EMF was mesured, were remo- 

 ved a little. 



I.i 



O [E 



| pH 



W, 



Ipin Piv| 



Fig. 7. 



If g and g' are two nearly identic galvanometers, pr 

 and pn earth-plates in the one circuit, p m and pi V in the 

 other, then g shows the intensity of the current between 

 pi and p n , g' the intensity between p m and pi V . As the 

 figure shows, the circuits are advanced to each-other half 

 the distance (about 2,5 km) between them. 



-Jr. 



Results. 



As M:r Wild observed the earth-currents 1882-83 in 

 Pawlowsk simultaneously with the observations in Sodan- 

 kylä and published his results soon afterwards, we hawe 

 found it most convenient to give an account of them (and 



