Radiators in Wireless Telegraphy, 



689 



with the coils in positions (A. A.). The results are set out in 

 the curve in fig. 4. 



Fiff. 4. 



JDi.sCd.nce in feet; 



Exp. IV. Effect of varying distance. Small coils horizontal 

 aud 6 inches above the ground. — A similar set of measure- 

 ments were made with the small coils 2 feet in side and 

 having 8 turns on each coil. The primary current was 5*4 

 amperes. The receiver circuit was tuned to a frequency of 

 214,400 in syntony with the transmitter current. 



The coils were placed at various distances and the receiver 

 currents measured. 



Table IV. 



Distance of Centres 

 in feet. 



Primary Current 

 in amperes. 



Secondary Current 

 in milliamperes. 



20 



54 



2-045 



35 



" 



0-402 



55 



>; 



0223 



80 



,, 



0-045 



105 





0027 



130 



» 



0034 



