6S8 Dr. J. A. Fleming on Magnetic Oscillators 



The curve shows that the inductive effect decreases at 

 first very rapidly with the distance, less rapidly than the 

 inverse cube but rather more than the inverse square of the 

 distance. 



Fig-. 3. 



too 

 U isCdnce irt-feeE. 



Exp. III. Effect of varying distance. Coils horizontal. — 

 The same coils were set in positions (CO.) with centres 

 6 inches above the ground. The receiver circuit was tuned 

 to a frequency of 162,000, and the primary current was 

 5*4 amperes. 



Table III. — Coils in position (O.C.). 



Distance of Centres 



Primary Current 



Secondary Current 



in feet. 



in amperes. 



in milliamperes. 



33 



5 '4 



53-1 



68 



jj 



41-4 



121 



j> 



12-4 



175 



5J 



0-57 



236 



)5 



0-28 



Here again the current falls off at a rate between the 

 inverse cube and inverse square, but the secondary current 

 has a much greater absolute value for the same distance than 



