NEGATIVE IMPEDANCES AND THE TWIN 21-TYPE REPEATER 513 



Field of Use 



Although the results of the field trial were satisfactory, it is not 

 planned to introduce the twin 21 -type of repeater into the plant at 

 the present time. It is not yet known whether the features of this 

 type of repeater will prove of advantage as compared with the 21 or 

 22-type repeaters. However, with the continued increase in the use 

 of repeatered circuits, over which it is desired to transmit d-c. signaling 

 or dial impulses, it is possible that this may be the case and further 

 studies are planned to determine its economic field of use. 



