CHAPTER XH. 



MISCELLANEOUS METHODS. 



"It never rains but it pours." Almost 

 simultaneously with the demonstration of the 

 Morse telegraph other types were devised. 

 There were the needle systems of Cooke and 

 Wheatstone, the chemical telegraph of Alex- 

 ander Bain, and soon the printing telegraph 

 of House, and later that of Hughes. The lat- 

 ter is in use on the continent of Europe, and 

 a modification of it has a very limited use on 

 some American lines. The Bain telegraph 

 used a key and battery the same as the Morse 

 system, but it did not depend upon electro- 

 magnetism as the Morse system does. When 

 in operation a strip of paper was made to move 

 under an iron stylus at the receiving-end of 

 the line. The paper was saturated with some 

 chemical that would discolor by the electro- 

 lytic action of the current. When a message 

 was sent the paper was set to moving by a 

 clock mechanism or otherwise, under the sty- 

 lus that was pressing on the paper as it passed 

 108 



