Ox THE EFFICIENCY OF EDISON'S ELECTRIC LIGHT 203 



The increased efficiency, with rise of temperature, is clearly shown 

 by the table, and there is no reason, provided the carbons can be made 

 to stand, why the number of candles per horse power might not be 

 greatly increased, seeing that the amount which can be obtained from 

 the arc is from 1000 to 1500 candles per horse power. Provided the 

 lamp can be made either cheap enough or durable enough, there is no 

 reasonable doubt of the practical success of the light, but this point 

 will evidently require much further experiment before the light can be 

 pronounced practicable. 



In conclusion, we must thank Mr. Edison for placing his entire 

 establishment at our disposal in order that we might form a just and 

 unbiased estimate of the economy of his light. 



