18 PHOTO-TELEGRAPHY 



The commercial utility of photo -telegraphy only 

 commenced after the adoption of Professor Korn's 

 instruments by the Daily Mirror. Although his 

 selenium machines were installed in Berlin and 

 Paris at the same time, the Daily Mirror in 

 London may be said to be the only journal that 

 has utilised them, or any subsequent machine, 

 in -a really commercial way. Two of Korn's 

 selenium machines were installed in Stockholm 

 and Copenhagen in 1908, and some trans- 

 missions have been made by the newspapers which 

 took up his system, but ever since their instal- 

 lation of the selenium instrument in November, 

 1907, the Daily Mirror has systematically carried 

 out transmissions and has persistently endeavoured 

 to develop tHe really practical side. The large 

 amount of experimental work that I have carried 

 out has been done entirely for the Daily Mirror, 

 and the present state of efficiency of this new 

 science is very largely due to the substantial help 

 they have given to it. 



This chapter has been written from a more or less 

 historical standpoint, and it may therefore be said 

 that the commercial or practical history commenced 

 in 1907 with the use of Korn's selenium machines. 

 The progress that has been made during the last 

 two and a -half years has been very considerable, 

 and has been almost entirely due to paying the 

 closest attention to small details. The mechanical 



