436 H. A. Rowland — Electrical Measurement. 



Method 1. 



1/ _ [r(R, + R")+R„(r + R,)] [R'^ + RJ + R'^ + R')] 

 c ' (R, + R" + R„) 9 



Method 2. 



— or b'LV or - ^-, 

 c tree 



[R„R'-R,R"] [R, (r + R") + R„(r + R,)] 



Method 3. 

 In (1) make R' = R" = R„ = or in (2) make R"= R 1 = 



R =oo,— =rrR' 



" c 



In case the circuit r contains some self inductance, Z, we can 

 correct for it by the equation 



T- *(-«) 



Method Jf. 



h- [R^ + RJ + R^R^RJJLR^R^+RJ+R^^ + RJ] 

 c ~ R' R" 



Method 5. 



L, _ [R,(R" + R„) + R„ (R" + R") J[R'(R" + R J + r(R' + R") ] 

 c (R'+li") (R" + RJ 



Method 6. 



t rl=(R + R')(R" + r) 



We can correct for self inductions, I/, L" in the circuits 

 R', R" by using the exact equation 



£ a [[L^ + R'') + (V-^W'] [l''(R + R')+R ,/ (L+L')] + 



R'R"(r + R")(R + R') 

 or approximately 



l. (IUR ,w r + fl L' L"R + R' L[L'(r + R ") + L"R '] 

 -=(R + R)(R +r)-~— -g^+6- gi- 



+ etc. 



