[cline] radiation AT THE SURFACE OF THE EARTH 129 



TABLE X— Continued. 



In order to submit the question of a diurnal change in the inten- 

 sity of the penetrating radiation to a further test a second set of 

 readings was taken over a period of twenty-four hours. In these a 

 cylinder of galvanized iron was used of capacity 29950 ces. The 

 electrode in this case was divided into sections, the one portion ex- 

 tending from the gold-leaf to the top of the electroscope and the other 



