82 



ELECTROLYSIS. 



maintain the electro-magnets in a suitable state of magnetic 

 saturation, and the currents of the principal machine are, after 

 having been duly rectified, sent into the electroplating vats. 



We shall see in another chapter that Mr. Wilde has com- 

 bined a new system of dynamo, simpler and more powerful than 

 the one which we have just described ; but we wished to say a 

 few words respecting the machine, the most perfect and the 

 most generally used in industry before M. Gramme's conception 

 made its triumphal appearance. 



WESTON MACHINE. The Weston machine (Fig. 17) is 

 greatly appreciated in America, and especially in the numerous 



FIG. 17. 



Weston Machine. 



nickeling factories of New York and Philadelphia. It is com- 

 posed of a shaft armed with six radiating electro-magnets 

 regularly distributed, and a cast-iron cylindrical casing, inside 

 which are six stationary electro-magnets corresponding to the 

 first mentioned. 



The cylindrical casing is bolted to a bed-plate. The rotation 

 of the spindle gives rise to alternating induced currents in 

 the electro-magnets which are revolving with it. These 

 currents are rectified, and go to excite the fixed electro- 



