^ --'- ^^ 



Figure 77. — a. Brushes and commutator; b, armature connections, and c, output regulator 

 for the Siemens and Halske dynamo of 1876; d, e, views of a Siemens and Halske motor of 

 the same date with a permanent magnet field and drum armature. From R. W. H. P. 

 Higgs and J. R. Brittle, "Some Recent Improvements in Dynamo-Electric Apparatus," 

 Minutes of the Proceedings oj the Institution of Civil Engineers, 1878, vol. 52, pp. 36-98, pi. i. 



the current form of the arc light and that would all be 

 on the same circuit. This was the problem of the 

 subdivision of the electric light. 



The first significant step towards the solution of 

 this problem was made by a Russian military 

 engineer named Paul Jablochkofr.'"^ He had retired 



w* "JablochkofT," La Grande Encyclopidie, Paris, n.d., vol. 20, 

 p. 1152; Electrician, London, 1894, vol. 32, pp. 663-664. 



from the army in order to devote himself to the in- 

 vention of an electrical light and decided to visit the 

 Philadelphia Centennial Exposition of 1876. How- 

 ever, he tarried in Paris in order to visit Breguet's 

 electrical shop, where both Gramme dynamos and 

 Serrin regulators were constructed; and he was so 

 fascinated by what he saw that he never finished his 

 journey. Instead, he found employment at Breguet's 



P.-^PER 30: DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: III 



393 



