a ffecting the Transmission of Electric Waves. 



Percentage 

 of maximum 



distance 

 over land to 



over sea. 



ph - co 



00 x> x> 



Maximum 

 signal distance. 



Over the 

 land. 



co 



© © M3 O 

 xa 



P 



At sea. 



miles. 

 62 



62 



65 



■H O S3 



•3 P rP 



pq 



if O O 



9 © tS 

 o ^ P 



a 3& 



^ © s 



P3 ° p 



T 2 



