CHAPTER IV. 



THE THORNE - BAKER SYSTEM DIFFERENCES 

 BETWEEN THE TELECTROGRAPH AND EAR- 

 LIER CHEMICAL SYSTEMS ^ELECTROLYTIC 

 RECORDS OF CURRENTS TRANSMITTED 

 THROUGH LONG CABLES THE THORNE- 

 BAKER LINE-BALANCEWORK WITH THE 

 ELECTROLYTIC TELECTROGRAPH. 



THE simplest and most practical apparatus for 

 photo -telegraphy at the present time is fairly 

 admitted to be the telectrograph, which came 

 into use by the Daily Mirror in July, 1909. 

 It was seen in the first chapter that Bakewell 

 had obtained some promising results with his 

 chemical telautograph, in which he used a picture 

 produced in lines on a metal foil, the lines being 

 of an insulating character such as offered by shellac, 

 gum, or glue, etc. 



One of his chief difficulties was found in the 

 synchronism, yet results were obtained, and some 

 of the most interesting of these were telegraphed 

 written matter. The telectrograph, by which 



