6 



shipped from the factory, they are ready to put up and start 

 running without change or adjustment. 



3d. By a very simple and ingenious device added to the 

 lamps that are to be burned a number at a time in a single cir- 

 cuit, no one lamp can get more than its share of the total cur- 

 rent, but all burn with equal steadiness and power. Another 

 device provides for any possible accident that may prevent one 

 lamp from burning properly, from interfering with the others in 

 the same circuit, for, by its operation, that lamp is automatically 

 cut out of the circuit until it is ready to burn properly again, 

 when it is automatically cut into circuit, all without interfering 

 with any other lamp. 



4th. The lamps are so constructed that the light may be used 

 with its full power, or a ground glass or opal globe may be used 

 to reduce its intensity or power to any required degree. It is 

 thus adapted for use in all places where a light of great power, 

 or a more diffused and softened light, is needed. 



Cost and Advantages. 



The cost of light produced by this apparatus consists of the 

 following items: Cost of power to run the machine; cost of at- 

 tendance upon engine and machine; wear and tear of apparatus; 

 cost of carbons burned in the lamps. The first two items would 

 vary with the location and circumstances. Where power is in 

 use for other purposes, and there is a small surplus which can 

 be used for running the machine, no additional expense is in- 

 curred, and the first two items may be omitted from the account. 

 The wear and tear of the electrical apparatus is not four per 

 cent, per year — far less than in most moving machinery. This 

 comes from the fact that the Brush Apparatus is the simplest 

 and most durable yet brought out. Even a cursory examination 

 shows this. The expense for carbons consumed in each lamp 

 varies from three cents to five cents per hour. Where cost of 

 power and attendance may be omitted, and large spaces are to 

 be lighted, the saving over gas is great, falling, under circum- 

 stances, favoring the electric light, to as low as one-twentieth the 

 cost of an equal amount of gas-light. 



