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be uniform, in order that all lamps may give the same amount of light. To accomplish this by running conductors directly from the generators, would involve
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/33/Incandescent_Electric_Lighting_-_Fig_13.png/400px-Incandescent_Electric_Lighting_-_Fig_13.png)
Fig. 13.
the use of wires so large as to practically debar their being used on account of the great cost of the copper employed in their manufacture.