Page:Incandescent electric lighting- A practical description of the Edison system.djvu/86

 those unpleasant features inherent in all other forms of artificial illumination.

The various devices once placed are likely to last under ordinary usage as long as the householder will probably live to enjoy them; the only exception to this general statement being the lamp itself which, with the proper current for which it is constructed, is guaranteed to last one thousand hours. As the lighting company replace all lamps burned out and, as they control the current to which they are subjected, there is no reason to doubt that their life will be prolonged to the utmost limit consistent with their being burned at their full

"Candle-power," which is that of an ordinary gas jet, from a two-foot burner.

The term candle-power refers to the standard wax candle, which is the unit of illumination adopted in grading electric lights; the lamps commonly used in dwellings being rated as giving a light equivalent to that of sixteen standard candles.

In addition to the large number of