CONTENTS. 



FIEST PART. 



SKETCH OF THE HISTORY AND PROGRESS OF THE ELECTRIC 



TELEGRAPH, WITH DESCRIPTIONS OF SOME OF THE 

 APPARATUS. 



I. EARLY OBSERVATIONS OF ELECTRICAL PHENOMENA. 



Page 



1. First Observations of Electricity by the Ancients ... 1 



2. Early Systematic Inquiries 1 



3. First Transmission of Electricity 2 



4. Terms, " Electrics and Non-Electrics " 2 



5. Terms, "Vitreous and Kesinous" 2 



6. Franklin's Theory Terms, " Positive and Negative ". . 3 



7. Winckler and Watson 3 



8. Discovery of the Ley den-jar 3 



9. Watson's Leyden-jar 4 



10. Experiments in Transmission 5 



II. TELEGRAPHS BY FRICTIONAL ELECTRICITY. 



11. First Published Idea of an Electric Telegraph .... 6 



12. Lesage's Telegraph 8 



13. Pith-ball Electroscopes 8 



14. Lomond's Telegraph 9 



15. Reusser's Telegraph 9 



16. Silva and Betancourt's Telegraph 10 



17. Cavallo's Telegraph 10 



18. Eonalds' Telegraph 10 



