CHAPTER III. 



THE KORN TELAUTOGRAPH PRINCIPLES OF 

 WORKING ADVANTAGES OVER SELENIUM- 

 EARLY WORK WITH LINE PICTURES EXPE- 

 RIMENTS WITH TELEPHONE AND TELEGRAPH 

 CABLES RECENT PROGRESS WITH THE 

 TELAUTOGRAPH. 



THE telautograph as arranged by Professor Korn 

 is really a combination of Caselli's transmitter with 

 the Einthoven galvanometer and photographic 

 receiver as used in the selenium machines. From 

 the very first the stringent limitation to simple por- 

 traits dictated by the use of the selenium instru- 

 ments was felt, and with the introduction of the 

 telautograph a new and commercial field of work 

 was opened up. There are doubtless a great 

 number of important or interesting men and 

 women in the world, but there are every day 

 hundreds of interesting " news snapshots/' and 

 while portraits of the former become more or less 

 exhausted at times, the " photo d j actualite " is 

 always obtainable and commands interest. 



The first function of the telautograph was to 

 telegraph sketches or drawings in line, the sketches 



