T ROOM, ELECTRIC TELEGRAPH OFFICE, CHARING CROSS. 



THE ELECTRIC TELEGRAPH. 



CHAPTEE I. 



1. Subjugation of the powers of nature to human uses. 2. Locomotion 

 twenty years since. 3. Circulation of intelligence then. 4. Supposed 

 prediction of succeeding improvements Railway locomotion. 5. 

 Electric telegraphy. 6. Fabrication of diamonds sun pictures gas- 

 lighting electro -metallurgy. 7. Such predictions would have been 

 deemed incredible. 8. Electro-telegraphy the most incredible of all. 

 9. Remarkable experiment by Messrs. Leverrier and Lardner. 

 10. Velocity of electric current. 11. No limit to the celerity of 

 telegraphy. 12. Physical character of electricity. 13. Not essential 

 to the explanation of electro -telegraphy. 14. Electricity a subtle 

 fluid. 15. Properties available for telegraphy. 16. Voltaic battery. 

 17 It is to the electric telegraph what the boiler is to the steam- 

 engine. 18. Means of transmitting the fluid in required directions. 

 19. Conductors and insulators. 20. Conducting wires. 21. Voltaic 

 battery. 22. Transmission and suspension of the current. 23. Current 

 established by earth contact. 24. Theories of earth contact 25. 

 The return of the current through the earth. 26. Various bodies 

 LARDNER'S MUSEUM ov ScuaiOB. I 113 



No. 31. 



