An incident of the Manhattan meeting of the American Institute of Electrical Engineers last week (see below) was Dr. Matthew Luckiesh's presentation of his new General Electric sunlight lamp. The bulb is 6ΒΌ in. long. It contains two separated tungsten electrodes, a little pool of mercury, a tungsten filament. When the electric switch is turned, current heats the filament to incandescence. The heat vaporizes the mercury. The mercury vapor diffuses between the electrodes and permits the current to jump across as a brilliant mercury arc. The combined light of arc, electrodes and...
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