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 4 iltutm,, ' /(. Kill /«W 



Figure 14. — Schilling's basic elements for his 1832 telegraph (needle galva- 

 nometer and call alarm). From E. Feyerabend, Der Telegraph von Gauss und 

 Weber . . .; Berlin, 1933, p. 21. 



PAPER 29: DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: 11 



287 



