

Fig. 64. MAGNETO-ELECTRIC MACHINE. 



THE ELECTRIC TELEGRAPH. 



CHAPTER VII. 



163. Momentary currents alternately in contrary directions. 164. Method 

 of producing momentary currents all in the same direction. 

 165. Magneto-electric machine. 166. Its effects in producing shocks 

 and currents. 167. Method of applying it to telegraphs. 168. 

 Chemical property of the current. 169. Decomposition of water. 

 170. Application of this property to produce written characters at 

 a distance. 171. Methods of moving the paper under the style. 

 172. Telegraphic characters marked upon it. 173. Use of relay 

 magnets in cases of feeble currents. 174. Form and application of 

 them. 175. Telegraphic lines constructed by companies in England 

 and America, and chiefly by the state on the continent. 176. Various 

 forms of instruments used. 177. Influence of national feeling. 178. 



LARDNER'S MUSEUM OP SCIENCE. B 



No. 41. 



