CONTENTS 



CHAPTER I 



THE DEVELOPMENT OF THE TELEGRAPH 



Fundamental discoveries, p. 4 Plan suggested early in the eight- 

 eenth century, p. 5 Some early experiments, p. 8 The telegraph 

 of Alexandre, p. 9 Galvanism gives a new stimulus to inventors, 

 p. ii Sommering's telegraph, p. 12 Electro-magnetism gives new 

 clues, p. 14 Experiments on magnets, p. 16 The first practical 

 telegraph system, p. 16 Antecedents and early experiments of 

 Morse, p. 18 Morse's first public exhibition of his telegraph, p. 20 

 A regrettable controversy, p. 2 1 Principle of the Morse telegraph, 

 p. 23 Multiple messages, p. 25 Gray's "Harmonic Telegraph," p. 

 26 Telegraph recorders, p. 28. 



CHAPTER II 



THE SUBMARINE CABLE 



England linked with the Continent, p. 31 Cyrus Field projects 

 the Atlantic Cable, p. 33 Doubts of the scientists, p. 34 High 

 hopes and failure, p. 35 A second fiasco, p. 37 Success at last, 

 p. 39 Improved methods and new cables, p. 40 The cable of '65, 

 p. 41 The Great Eastern pressed into service, p. 43 Instrumental 

 aids, p. 45- 



CHAPTER III 



WIRELESS TELEGRAPHY 



Water and earth as conductors, p. 48 Discoveries of Professor 

 Trowbridgeof Harvard, p. 49 The wireless telegraph of Smith and 

 Granville, p. 51 Experiments with "Hertzian waves," p. 52 

 Dr. Branly's coherer, p. 53 The work of Marconi, p. 54 Methods 

 and results, p. 56 Marconi's early attempts, p. 58 Practical dem- 

 onstration of the usefulness of wireless on ships, p. 59 Trans- 

 Atlantic messages, p. 60 Tuning the messages, p. 61 The prac- 

 tical status of wireless telegraphy, p. 63 Wireless in the Russo- 

 Japanese war, p. 65. 



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