Multiple tTranemtssion. 



spending in rate per second to that of the 

 vibrator. The same is true of battery B' 

 and vibrator 2. During the time any key 

 is depressed we will say of tone No. 1 

 this tone will be transmitted through the 



In this diagram, 1 and 2 are tuned reeds; 1 A 2A are receivers 

 tuned to the reeds 1 and vJ respectively; 1 and IA are in uni- 

 son, also 3 and 2A, but. the two groups (the Is and the 2s) differ 

 from each other in pitch. 



line and be reproduced by its mate the one 

 tuned in accord with it at the receiving-sta- 

 tion. By a succession of long and short tones 

 representing the Morse code a message can be 

 sent. Numbers two, three and four might be 

 sending at the same time, but they would not 

 interfere with number one or with each other. 

 In 1876-7 the writer succeeded in sending 

 fight simultaneous messages between New 

 Y<rk and Philadelphia by the harmonic 



hod. 



There were two ways of reading by the har- 

 Tiioi lie method. One was by the long and 

 short t ono-sounds and the other by the ordi- 

 nary sounder. 



