APPENDIX 



REFERENCE LIST AND NOTES 

 CHAPTER I 



THE DEVELOPMENT OF THE TELEGRAPH 



In connection with this chapter the reader may advantageously 

 consult any or all of the chapters in earlier volumes dealing with 

 the development of electricity. The index will serve as a ready 

 guide. There is also a reference list on the subject given in the 

 Appendix to volume VI. under chapter VIII., "The Smallest 

 Workers" (vol. VI., p. 324). Chapter VIII. itself, in vol. VI. 

 (p. 148, so/.), will be particularly useful as dealing with the theories 

 of electrical action. 



(p. 4). The full account of Stephen Gray's discoveries in con- 

 nection with conduction and insulation of currents will be found 

 in vol. II., p. 262 seq. 



(pp. 5-8). An anonymous communication suggesting the use 

 of electricity for the purposes of telegraphy appeared, as stated 

 in the text, in Scot's Magazine for February 17, 1753. 



(p. n). The story of the discovery of the galvanic or voltaic 

 battery is told in vol. III., p. 229 seq. 



(p. 14). Electro-magnetism gives new clues. The discoveries 

 of Oersted and Faraday are recorded in vol. III., p. 236 seq. 



(pp. 21, 22). Dr. Jackson's alleged connection with Morse's 

 discovery. The quotation is from The History and Progress of 

 the Electric Telegraph, by Robert Sabine, C.E., New York, 1869, 

 pp. 32-33. 



CHAPTER II 



THE SUBMARINE CABLE 



(p. 40). Enthusiasm over the successful laying of the cable. 

 The quotation is from The Times, London, August 6, 1858. 



[323] 



