VARIOUS GENERATORS OF ELECTRIC LIGHT. 6 1 



inducing action and the appearance of the current is less than 

 the fifty thousandth part of a second, and the current, feeble 

 at the commencement, gradually increases, then diminishes, 

 and ceases in a space of time varying with the intensity of 

 the induced current, but which is on the average the two 

 hundredth of a second. Mouton has shown that this dimi- 

 nution of the induced current takes place by oscillations suc- 

 cessively decreasing. 



To conclude, we shall add that if several induction effects 

 can arise under the influence of the same inducer, the total 

 resulting current cannot have a greater intensity than that which 

 would result from a single one of these effects, if the action 

 causing this last were acting under its maximum condition ; 

 for the inducing force is divided like the attractive force. 

 Hence certain machines in which several kinds of inductions 

 are combined do not yield more than others in which only 

 one kind of induction is in action. 



VARIOUS MAGNETO-ELECTRIC GENERATORS OF ELECTRIC 

 LIGHT. 



In tomes IT. and V. of my Expose des applications de- 

 relectridtc I have given a nearly complete history of the 

 various induction generators that have been invented ; but as 

 we have now to consider only machines for light, only those 

 generators which have yielded the most important results will 

 occupy our attention, and these are : 1, the machines of 

 the Alliance Co.; 2, the dynamo-electric machines of Wilde, 

 Ladd, Wallace Farmer, Siemens, Lontin, &c. ; 3, the elec- 

 tro-magnetic machines with rings of Gramme, De Meritens 1 , 

 Brush, and Biirgin; 4, the divided current machines of 



