rapidly being introduced into locations where its peculiar ad- 

 vantages make it the cheapest and best light. It is not offered 

 for domestic purposes, because in dwellings it is not as cheap as 

 gas or oil, and is not yet adapted to such uses. 



The apparatus consists of a Dynamo-Electric Machine, which 

 generates the current of electricity, and Electric Lamps or regu- 

 lators for holding and feeding the carbon points, which, by 

 their consumption in the voltaic arc, produce the light. Both 

 are the invention of Charles F. Brush, M. E,, of Cleveland, a 

 gentleman of the most extensive and accurate scientific attain- 

 ments, especially in the field of Dynamo -Electricity. By the 

 highest scientific authorities in this country they have been given 

 the first place among all machines or apparatus of this kind now 

 in practical use. 



Points of Excellence. 



The prominent points in which the Brush Machine excels all 

 others of its class, are the following: 



1st. It produces the greatest amount of light in proportion 

 to the power used in driving the machine, and the least amount 

 of heat in the machine itself. 



2d. It is more simple in its construction, and less liable to 

 require repairs, being fully as durable in all respects as the 

 highest grade of steam engines. 



3d. A single Brush Machine will produce any number of 

 lights desired, from one up to twenty, all in one circuit, all 

 equally steady. 



The peculiar points of excellence in the Electric Lamps or 

 Regulators are the following: 



1st. They are entirely automatic in their action, keeping the 

 carbon points at the exact distance from each other that pro- 

 duces the best effect and feeding them down regularly until en- 

 tirely consumed, without requiring the slightest attention or 

 adjustment. 



2d. Not a trace of clockwork, or mechanism of that charac- 

 ter, or any complex parts, are used in the lamps, and their ac- 

 tion is controlled entirely by the current. When finished and 



