'988 Dr. Gr. Breit on the Effective Capacity of 



Substituting these values into the value of C /M just 

 found, 



n >ff_ K n lA2 [ 1 , y &PS , *■/-, , ^ Ps 2 



U -&^aFl'~2 + f(4 5 -l)(4.-2) + 4l i+ T47-l 



+ d(^-l)&f+4, 2 -2)]' ' ' ■ (31) 



where now the result is expressed without making use of the 

 notation X' but using throughout the ordinary 2. 



Now Co" must be calculated by finding the charge on 

 the side of the square given by values of v included 



rrr 



between and — . If this charge is Q, 



z 



(32) 



© 



because — L(y J is the excess of the potential of that 



plate over the potential of the opposite plate. 



In virtue of (29), the charge between v and v + dv is 



di 



dt 



- j^^n {(4s-l>-|}] ? 

 so that the total charge on the face considered is 



and therefore by (32) 



k ILA di (' 2 

 8-7ra dt 



. . . (33) 

 or performing the integrations 



c 



„ = « ZAV2 r 1 _ g _psi _ _ _ (34) 



87ra L s= i 4s — 1J 



