1'ig. 34. LAYISG THE CABLE FROM THE DECK OF THE SHIP. 



THE ELECTRIC TELEGRAPH. 



CHAPTER III. 



67. Wires of Magneto-electric Telegraph Company. 68. Mr. Bright' s 

 method of detecting faulty points. 69. Such failure of insulation 

 rare. 70. Underground method recently abandoned in Prussia. 

 71. Underground wires of the European and Submarine Company. 

 72. Imperfect insulation in tunnels. 73. Mr. Walker's method ol 

 remedying this. 74. Overground system adopted through the streets 

 of cities in France, and in the United States. 75. Telegraphic lines 

 need not follow railways. 76. Do not in America nor in certain 

 parts of Europe. 77. Submarine cables. 78. Cable connecting Dover 

 and Calais. 79. Failure of first attempt Improved structure. 

 SO. Table of submarine cables and their dimensions. 81. Dimensions 

 and structure of the Dover and Calais cable. 82. Holyhead and 

 Howth cable. 83. First attempt to lay cable between Portpatrick 

 and Donaghadee its failure. 84. Dover and Ostend. 85. Port- 

 patrick and Donaghadee. 86. Orfordness and the Hague. 



67. THE \vires of the Magnetic Telegraph Company are laid and 

 protected in the following manner. 



LARDNER'S MUSEUM OF SCIENCE. L 145 



Ko. 3f. 



