Abstract
A NEW incandescent electric lamp with an efficiency of about 0.5 watt per candle-power has just been placed on the market by several of the leading manufacturers in this country. It is only a few years since the tungsten filament lamp, with an efficiency of between 1 and 11/4 watts per candle-power appeared, to displace the carbon filament lamp the efficiency of which was between 3 and 4 watts per candle-power. In the case of the “half-watt” lamp, however, there is no change in the material of the filament. This is still tungsten.
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A New Incandescent Electric Lamp . Nature 92, 595–596 (1914). https://doi.org/10.1038/092595c0
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DOI: https://doi.org/10.1038/092595c0