COMMON BATTERY ANTI-SIDETONE SUBSCRIBER SET 251 



E, = E2 



j(l2)lr(l)+T(2)/BY THE SUPER- 

 'IS I IS ' IS "(^ POSITION THEOREM 



"lA 1 Ma+Ma \position theorem 



FIGURE 

 7S 



FIGURE 

 8S 



FIGURE 

 9S 



FIGURE 

 9A 



E| = E2 



Group IV — Transmitting efficiency — sidetone balance 



