Figure 71. — Hjorth's motor. From Illustrated 

 London News, May 12, 1849, vol. 14, p. 309. 



and asserted that "what is certain until the present 

 time, is that no electric motor has reached one 

 horsepower in magnitude." '^* However, Du Moncel 

 was not pessimistic, for he saw in the dynamo that had 

 recently been invented a device that might be con- 

 verted into a commercially successful motor. How 

 this development occurred will be discussed in a 

 subsequent article of this series. 



'" Theodose du Moncel, Expose des applications de V Hectricite 

 ed. 3, Paris, 1878, vol. 5, p. 343. 



PAPER 28: DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: I 



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