Household lighting has been one continuous effort to render the hours of darkness bright, and to provide by artificial means a luminosity which would, if not actually rivalling the sun, enable people to carry on their life with the same ease, convenience, and comfort after daylight had disappeared as during the earlier portion of the day. Every stage which has been advanced in artificial lighting has been welcomed in the home just as much as in the factory and in the workshop, for there are many daily duties as well as pleasures and amusements which are carried out much more satisfactorily when a good light is available than when there are shadows and dark corners only dimly lighted.