TRANSMISSION SYSTEM FOR TELKTYPliWRITER 



543 



portion of the current limiting resistance in series between the sub- 

 scriber Hne jack at the switchboard and the subscriber hne. For 

 longer circuits an impedance modifying network consisting of capaci- 

 tance, inductance, and resistance in parallel is inserted in series with 

 the circuit between the subscriber line jack and the subscriber line. 

 The constants of this network are so chosen that the subscriber line 



Fig. 6 — T>pical teletypewriter subscriber station. 



will be satisfactorily balanced by the same cord circuit repeater 

 balancing arrangement that is used for the shorter subscriber lines in 

 the ofifice. 



At the station the sending contacts and receiving relay or magnet 

 are in series with the subscriber line. Signals from subscriber stations 

 are formed simply by opening and closing the circuit at the sending 



