Excerpt from Science Progress in the Twentieth Century, 1912, Vol. 6: A Quarterly Journal of Scientific Work Thought
Electric lamps have been improved so materially during the past few years that to-day the position of the electric light is radically different from that of ten or even five years ago. At that time the methods of lighting by electricity appeared to be in a stable, if not in a stagnant, state. The carbon filament lamp, the original glow-lamp of Edison and Swan, had been brought to perfection so far as that desirable condition is ever likely to be reached in the case of an article manufactured in many millions annually: for interior lighting of all but the largest rooms it represented the best lamp that the electrical engineer could produce to compete with the high-efficiency mantle at the disposal of the gas engineer. In many respects doubtless a most efficient competitor, it was heavily handicapped by the high running cost. The best that could be hoped for with any confidence was a steady advancement in its use as more and more persons found themselves in a position to indulge in what was undoubtedly a luxury in artificial lighting; any great advance such as would be caused by the opening up of new fields could only be the result of some radical improvement which would at one stroke bring electric lighting into effective competition with gas on the score of cost. That improvement came with the invention of the metallic filament lamp and when once the initial difficulties of commercial manufacture were overcome interior electric lighting was given a fresh start. Almost at the same moment the production of satisfactory flame arc lamp carbons enabled electricians to make a great stride forward in the field of exterior lighting and the lighting of large interiors.
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