CHAPTER VII. 



THE TRANSMISSION OF PHOTOGRAPHS AND 

 PICTURES BY WIRELESS TELEGRAPHY. 



ANY attempt to solve the somewhat delicate 

 problem of transmitting photographs by " wire- 

 less "may at first sight seem unnecessary. But it 

 remains to be seen whether, for long-distance work, 

 it will not prove both more rapid and less expensive 

 than transmission by cable, especially where much 

 water intervenes as between America and Ireland 

 or this country. As seen in Chapter V., the 

 capacity of underground cables is very great as 

 compared with ordinary overhead wires, besides 

 which, between America and England, either two 

 cables would be required, or one and an earth 

 " return." The former would be extremely costly, 

 and the latter would render necessary apparatus 

 of a very delicate and sensitive character. 



The prospects opened up by a wireless method 

 of transmission are, on the other hand, of an 

 encouraging nature, as not only could long dis- 

 tances be covered at a high spaed, but photo- 

 graphs of criminals could be telegraphed to ships 



