Figure 36. — Patent Office model of House's printing tele- 

 graph, U.S. patent 9505 (December 28, 1852). {USNM 

 3^2674; Smithsonian photo SO^gG.) 



Figure 37. — Patent Office model of Hughes' printing tele- 

 graph, U.S. patent 14917 (May 20. 1856). {USNM 2^267^, 

 Smithsonian photo ^Svyy-G.) 



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



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