Figure 33. — Morse-Vail 1845 telegraph. From A. Vail, The 

 American Electro Magnetic Telegraph, Philadelphia, 1845, P- '9- 



Figure 34. — Morse system relay, key, and register of about 

 1846 (reproduction made about 30 years later). {USNM 

 iSoo^y; Smithsonian photo ^^668.) 



PAPER 29: .DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: II 



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