^64 TABLES 442-443. 



TABLE 442. 

 WIRELESS TELEGRAPHY. 



Radiation Resistances lor Various Wave-Lengths and Antenna Heights. 



The radiation theory of Hertz shows that the radiated energy of an oscillator may be repre- 

 sented by E= constant (h'/A 2 ) I 2 , where h is the length of the oscillator, A, the wave-length and 

 I the current at its center. For a flat-top antenna E == 1600 (h 2 / A 2 ) I 2 watts ; 1600 h 2 / A 2 is called 

 the radiation resistance. 



(h = height to center of capacity of conducting system.) 



Austin, Jour. Wash. Acad. of Sci. i, p. 190, 1911. 



TABLE 443. 

 THE DIELECTRIC PROPERTIES OF NON-CONDUCTORS. 



Phillips Thomas, J. Franklin Inst. 176, 283, 1913. 



SMITHSONIAN TABLES. 



