AUSTIN: COIL, ANTEJNNAS 339 



ceiving on an antenna, seems to offer the most accm'ate method 

 for determining antenna effective height.^ 



Table 4 gives the effective heights of antennas which are 

 equivalent either for sending or receiving to coils of various area 

 turns, calculated from equation 5, 



The observations in this paper have been taken for the most 

 part by W. B. Grimes, Chief Electrician (Radio), assistant in the 

 laboratory. 



^ In experiments of this kind incorrect results may be obtained, if observations are 

 made too near the natural wave length of the coil, as in the case the current distri- 

 bution is no longer uniform on account of the effect of the distributed capacity. 



