45 2 



Tables 537 and 538 

 WIRELESS TELEGRAPHY 



TABLE 537.— Radiation Resistances for 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 2 /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 538. — The Dielectric Properties of Nonconductors 

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



Smitmsonkn Tables. 



