134 



Prof. P. 0. Pedersen on the 



understand the centre of gravity for the area drawn in 

 accordance with fig. 3 representing Nv(#) — lies at the 

 distance r v from A given by 



r.+ ^ia + k) 



(15) 



Pig. 4 shows for a definite case the position of the 

 centre of gravity for the first ten classes and their relative 

 magnitudes. 



Ai 



A o 



Fig. 4. 



Ito 



n. 



v 



10 V. 



r 



p 



4. From the preceding it follows that the total number of 

 electrons ri a which reaches the B electrode is 



i 



— ft v—0 



v — u I 



~ {ll— V) „ ^ \ III . sy | 



(16) 



where 



y- 



. e l 



and 



u = j€ l, 



(16') 



while v l is the greatest integer which is less than or equal 

 to h. 



