422 



BELL SYSTEM TECHNICAL JOURNAL 



A complete operating equipment embodying the general principles 

 described has been designed with the cooperation of the engineers of 

 the Western Union Telegraph Company for the New York-Azores 

 permalloy loaded cable and has been in actual commercial operation 

 for many months. Provision has been made in the design of this 

 apparatus for the extension of the circuit to Emden, Germany, over the 

 Azores-Emden cable of the Deutsch-Atlantische Telegraphengesell- 

 schaft, and automatic repeaters for the Azores station and terminal 

 equipment for the Emden station have been installed and are now 

 undergoing tests preliminary to the establishment of through-operation 

 between New York and Emden. 



Appendix I 



Synchronous Vibrating Relay 

 There are several methods which may be employed to obtain the 

 synchronous vibrating feature, one of which is shown schematically in 

 Fig. 9. The relay is of the polarized type having two separate 



SENDING BRUSH — ■ 



RECEIVING SEGMENTS! 



FIG. 3 

 Fig. 9 



windings, one of which, termed the line winding, is connected directly 

 in the output circuit of the amplifier, and the other, or vibrating 

 winding, is included in a circuit comprising the vibrating condenser, 



