COMMON BATTERY ANTI-SIDETONE SUBSCRIBER SET 251 



E| - E2 



T(l2)lr(l)+TC2)('BY THE SUPER- 

 '1"; ■ IS IS ]^ POSITION THEOREM 



U,^, 



BY THE RECIPROCITY 

 THEOREM AND £[=£2 



,(!)_' (1)1 DUETO^r(l)_, 

 '•IA-|MS|_WINDINGCj ^2A ^ 



r(l2)i,(l) + r(2) / BYTHESUPER- 

 I lA — 1|A^^IA \POSITION THEOREM 



FIGURE 

 8S 



FIGURE 

 9S 



IGURE 

 9A 



>!y FIGURE 



E| = E2 



Group IV — Transmitting efificiency — sidetone balance 



