The Marvellous Teleprinter 103 



Although with the Morse sounder only 

 one operator can use a key at a time, it is 

 nevertheless quite simple for two messages 

 to be sent in both directions on the same 

 wire. One would think that the four tele- 

 grams being transmitted would become 

 jumbled, and that a terrible mix-up would 

 result. We may consider the wire, for the 

 moment, like a wireless set upon which, by 

 various wave lengths many stations may be 

 secured. But here is a difference; with 

 wireless only one station can be had at a 

 time. With the telegraph instrument there 

 are four messages travelling at the same 

 time. We may, however, take the idea of 

 wave lengths of varying strengths as show- 

 ing what happens in the wire. 



Unless the wire could be split, as it were, 

 for the Teleprinter, it would not prove 

 more economical than the Morse sounder. 

 Actually the same method may obtain. 



In the future, a telegraphist will have to 

 be a typist, and touch-typing will be essential. 



