2 3 4 5 



e2+(2cr/f)2», 



Fig. 3. 

 . 2 — Attenuation factor for radio propagation ( 



;iTdA VO-/c)'t>&g _ 2irdA l/ (£-0g+(2Cf/f)^ ^ 21TdA \j,*i,-ycfo^ 



' i+ki2 " Ve'H2tf/f)2 V ^^H^o/fy ' vq '+0= 



Fig. 2. 



• pl.i. 



earth. The number on each curve gives the value of the Q ( = efl2a) to which it applies; a is the conductivity and « the dielectric constant in electrostatic 

 nits; / is the frequency in cycles per second; d/X is the ratio of the distance to the wave-length. 



Fig. 3 — Attenuation factor for radio propagation over a dielectric plane. The number on each curve gives the value of the dielectric constant to which it applies. 



