1011] 



on Radiotelegraphij . 



VM 



In this manner the receiver may be doubly tuned, with the result 

 that a far greater selectivity can be obtained than by the employment 

 of wave-tuning alone. 



In fact, it is quite easy to pickup simultaneously different messages 

 transmitted on the same wave length, but syntonised to different 

 group fre(|uencies. 



As far as wave tuning goes, very good] results — almost as good as 



RLSDNflNCi: CURVL 



orCLIFDEN 

 PRiriARY CIRCUIT 



TOTAL RESISTANCE 

 INCLUDING, SPAfW; 



B g Wave Len 

 IN FEET 



BREAK. 



D5CILLATI0IN5 CORRKPOINDirG TO ABQVL RESONANLt CURVL. 



0" -MM ^M -^oo Tmo •wo TmJT tSo -fS^ -^^ JLLJ. 



5ERIE5. or WAVE TRAINS RADIATEP from CLIFDErt AERIAL 

 5PARK FREQUEPIEY 500 PtR sec. 



Fig. 5. 



are obtainable by means of continuous oscillations — can be achieved 

 with groups of waves, the decrement of which is in each group • 03 

 or -OJ:, which means that about 30 or 40 useful oscillations are 

 radiated before their amplitude has become too small to perceptibly 

 affect the receiver. 



The condenser circuit at Clifden has a decrement of from -015 

 to "03 for fairly long waves. 



