^AK: 



JeVea iol fw te^ 



.^i/f/H/Ar/r/r-i'/l- 



OcjU-^d^^^A /ii^^-^SX- /i_^».y^ 



r 







Oe M w/7^'l /^ 



r 





Ji-'c/ 





Qo I 



-y/ is ol cteiL i.-&liylo5o d!r7i AJiocm.' /h. / (^ inivtau hcJi'/ ■ 



00 <L>ii- m 



^ incA-Actni^ ^ yai/Ylc) <./u,Tsuyut.i:f oJo/i Q^cnt~D 



'J dtV'ca--^' 





UiveJ^i'i' c'n Lalf^- 



c/ 



7^ 



Figure 3. — Money order sent by semaphore telegraph in 18 16. 

 Note the telegraph Mercury is carrying. Photo courtesy of 

 the Burndv Librarv. 



over actual land lines, still it was the first galvanic 

 telegraph that was worked out, and it stimulated 

 development of other electrical telegraphs both 

 directly and indirectly. Thus in 1816 J. R. Coxe ^ 

 suggested another electrochemical telegraph. 



5 J. R. Coxe, "Use of Galvanism as a Telegraph," Annals 

 of Philosophy, 1816, vol. 7, pp. 162-163. 



Andre Marie Ampere ^ was the first of many to see in 

 Hans Oersted's discovery of a relationship between 

 galvanism and magnetism a means of signaling at a 

 distance. However, Ampere did not immediately 



6 A. M. Ampere, "Memoire . . . sur les effets des courans 

 electriques," Annales de chimie et de physique, 1820, vol. 15, pp. 

 59-76, 170-218. 



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



277 



