Fig. 81. FROMENT'S ALPHABETICAL TELEGRAPH. 



THE ELECTRIC TELEGRAPH. 



CHAPTEE IX. 



201. Defects of the French and German instrument removed by Lippens' 

 instrument. 202. Description of it. 203. Its wheel commutator. 

 204. Transmission of despatches by it. 205. Froment's alphabetic 

 telegraph. 206. Morse's telegraph. 207. Froment's writing tele- 

 graph. 208. Bain's chemical telegraph. 209. Method of writing. 

 210. Electro-chemical pen. 211. Metallic desk. 



201. M. Lippens and the Belgian railway and telegraph authori- 

 ties by whom he has been supported, however contend, that 

 although the permanent staff of the state and public telegraphs 

 constantly occupied and practised in the manipulation of such 

 apparatus may be relied upon for the due management of such 

 adjustments, the agents of various grades employed on the rail- 

 ways, whose duties do not permanently connect them with the 

 telegraph, and who are only called to it from time to time, cannot 

 be depended on to perform adjustments requiring not only con- 

 stant practice, but some address and some special knowledge of 

 the principle and mechanism of the apparatus. 



LARDXER'S MUSEUM OP SCIENCE. D 33 



No. 43. 



