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BELL SYSTEM TECHNICAL JOURNAL 



In the foreground is the switchboard for enabling the operator to 

 control the radio-wire circuit at the connecting point. In the back- 

 ground are the transmitter units — four of them. These, together 

 with the four antennas with which the station is equipped, "multiplex" 

 the ether, in effect, and permit four channels to be established to as 

 many distant stations. It is intended that three of these be tele- 

 phone talking channels and the fourth a signaling or a reserve talking 

 channel. The receiving station is located at another point. It is 

 not desired to describe this station in any detail but merely to illus- 

 trate it as an example of a radio repeating station functioning to 



Fig. 7 



connect the wire system with ships at sea and capable of effecting 

 simultaneously three different connections. It is hoped that this 

 ship-to-shore development may be itself the subject of an Institute 

 paper. 



Intermediate Repeaters 



The transcontinental line with radio extensions as shown in Fig. 6 

 is a good illustration of the use of intermediate repeaters generally. 

 Two types of repeaters are represented, the straight wire telephone 



