1914] on Improvements in Long-Distance Telephony 



101 



Moreover, by a very ingenious arrangement it has l)een found 

 possible to load the phantom circuit by inductance coils, which are 

 so wound that whilst they add inductance to the phantom they do 

 not alter that of the component circuits, which last have, however, 

 their own independent loading coils. (See Fig. 8.) 



The upper diagram represents the mode of winding each 

 loading placed in the side circuits of a pair circuit cable. 

 The lower diagram represents the mode of carrying each 

 side circuit pair of conductors round a loading coil so as to 

 load the phantom circuit. The winding of one side circuit 

 only is shown. 



In this way a great economy of copper is obtained under a sort 

 of arithmetic in which 2 and 2 do not make 4 but make 6. 



In fact the phantom circuit is better than either of the circuits 

 of which it is composed ; for one reason because each conductor of 



