The great advantage possessed by Electric Light, over all its 

 rivals, for the illumination of places where considerable light in 

 large rooms or spaces is desired, is now generally conceded. 

 The light is pure white, and therefore gives natural colors to all 

 objects or materials illuminated by it. It does not vitiate the 

 atmosphere by giving off volumes of carbonic acid gas, and other 

 Don-respirable gases, as do gas and oil. An equal amount of 

 gas light produces about two hundred times as much heat. 



There are no dangers in its use at all corresponding to those 

 due to leaky gas-pipes, defective meters, exploding lamps, etc. 

 In places adapted to its use, it is by far the cheapest light that 

 can be obtained. It is the " coming light," the latest wonder of 

 the nineteenth century. 



Comparison with Foreign Systems. 



Comparisons of the Brush Apparatus with the best of the sys- 

 tems in use in Paris, of which so much has been written of late, 

 are favorable to the American system. 



The Jablochkoff Candle, as ordinarily used there, is placed in 

 a glass globe on a post ten feet high, and gives a light equal to 

 700 candles. One candle, burning an hour and a half, costs fif- 

 teen cents. If light is needed for a longer time, a fresh candle 

 must be substituted each hour and a half. If the candle is ac- 

 cidentally extinguished, it does not re-light itself, as does the 

 Brush lamp, but must be re-lit by hand. A Brush lamp of 3,000 

 candle-power, costs four cents per hour for carbon consumed, or 

 less than one-third the cost of the 700 candle-power light pro- 

 duced by the Jablochkoff candle. If the Brush lamp is acci- 

 dentally extinguished, it instantly re-lights itself, and it requires 

 attention only once in burning twelve hours continuously, where- 

 as the Jablochkoff candle would require attention seven times in 

 the same interval. 



So great has been the appreciation of the Brush Electric Light 

 Apparatus, as a practical substitute for gas and oil, for the illu- 

 mination of places suited to its use, that over Jive hundred lights 

 have already been sold for actual use, although it is less than a 

 year since the first order was filled. Some of the largest and 



