190 



ELECTRIC LIGHTING. 



Harisson, in which one of the carbons was replaced by a 

 carbon cylinder, movable on its axis, so as to make the con- 

 sumption slower. The upper carbon was moved by an 

 electro-magnetic system, which determined the formation of 



the arc and kept it con- 

 stant by means anala- 

 gous to those employed 

 in other regulators. 



Ducretet has improv- 

 ed this lamp by arrang- 

 ing it so as to give 

 simultaneously with the 

 arc powerful incandes- 

 cent effects. Fig. 48 

 represents this new ar- 

 rangement, which, I am 

 told, has given very good 

 results. 



Lastly came Reynier's 

 system, the most com- 

 plete of all, in which 

 each of the carbon discs 

 was set in motion sepa- 

 rately by a special clock- 

 work mechanism, and 

 the separation necessary 

 for the production of the 

 arc was obtained by an 



electro-magnetic system acting on one of the carbon-holders, 

 and producing effects like those in the other regulators of 

 this kind. (See my Expose, t. V.,p. 502.) 



Besides the apparatus of which we have just spoken, there 

 exists a class of electric lamps to which, in my work on the 

 applications of electricity, I have given the name of regu- 

 lators with hydrostatic actions, and which are at least very 

 interesting, though not very practical. For the regulating 



FIG. 48. 



