Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 473
as to be air-tight, and the air ispumped out througha little hole in thebottom of the globe,where you see the point, which is afterwardstopped by melting the glass. The filament gets white-hot—that is, incan-descent—when the electric current passes alongit, because it is not a good conductor,… … FIG. 9. BULB OF IN-CANDES-CENT LIGHT. i8J4] A LESSON IN ELECTRICITY. 461 current to light fifty or sixty arc-lamps, whichare arranged along the wire of the externalcircuit in a series, the current going from lampto lamp. But as a much smaller current willlight an incandescent lamp, a dynamo of…
Children's literature
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