Fig. 74. FRENCH RAILWAY TELEGRAPH. 



THE ELECTRIC TELEGRAPH. 



CHAPTER VIII. 



1S4. Form of commutator of French state telegraph. 185. Its operation. 

 186. Method of sending and receiving a despatch. 187. Batteries. 

 188. French railway telegraph. 189. French railway portable tele- 

 graph. 190. German railway telegraph. 191. Siemens' instrument. 



LARDNER'S MUSEUM, OF SCIENCE. c 17 



No. 42. 



