690 Dr. J. A. Fleming on Magnetic Oscillators 



The same law o£ variation holds good in this case also as 

 shown by the curve in fig. 5. 



Ft* 5. 



Histdnce mfeet 



Exp. Y. Effect of varying height above the ground. Coils in 

 position (A. A.) vertical. — The large coils were employed and 

 raised step by step to various heights above the ground. The 

 primary current was 5*4 amperes. The receiver was tuned 

 to a frequency of 162,000. The distance of the coils was 

 68 feet. The coils had their planes vertical and parallel to 

 each other except in the last case when they were placed 

 horizontal or in positions (C.C.) for comparison. 



Table V. 



Height of centre 



of Coil above 



ground, in feet and 



inches. 



Receiver Current 

 in milliamperes. 



Coil Position. 



ft. ins. 

 4 10 



7 2 



9 



10 10 



6 



20-98 

 21-76 

 21-50 

 16-84 

 31-08 



Coils vertical (A.A) 



J> 5> » 



J5 J5 )) 

 >J 5? J) 



Coils horizontal (C.C.) 



Here again is shown the improved effect of placing the 



