304 HENRY A. EOWLAKD 



Placing a capacity in the circuit R, we have also 

 b'M (M+ L) - %= rR 



In case the coil is wound with two or more twisted wires, M L is 

 small and known. For two wires, M L is negative. For three 

 wires, two in series against the third, M can be made nearly equal to 

 2L. Hence M, L and C can be determined absolutely, or C in terms 

 of M or vice versa. 



To correct for the self induction, I, or r we have the exact equations 



If the condenser is put in r, we have 



T M 



or - = rR + VM(L-M} 



Method 9. 

 MM-*, = R, 



or - VL'M + *=R I 



Making R" = co and r + R' = r we have 

 - VL'M+ M or VUM- ^ t 



C Lr 



Taking two observations we can eliminate WL'M and we have 



Knowing L'M we can find C'. Throwing out C' (i. e., making it 

 oo ) we can find WL'M in absolute measure : then put in C' and find its 

 value as above. 



To correct for self induction in R /f we have for case R" = oo , the 

 exact equation 



