86 ELECTRIC LIGHTING. 



lighted for an indefinite period, without requiring on the part 

 of the motor a speed of more than 700 turns per minute, 

 and without producing any appreciable heating ; but the light 

 furnished by these candles does not seem so powerful as that 

 of the candles supplied by the Gramme machines; and until 

 precise measures have been given, the relative power of this 



FIG. 24. 



generator cannot be definitely estimated. This machine is 

 magneto electric, and, like that of the Alliance, gives reversed 

 currents; but to produce the same effect it requires only 

 8 Allevard magnets instead of 48, and only a quarter of the 

 motive power. Such, at least, is De Meritens' statement. * 



The advantageous effects of this kind of machine result 

 from the fact that the induction currents produced in the 



* The truth is this machine requires if horse-power. 



