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wire, and connection to the outside is made through a thin copper wire w. The tube is provided with outside and inside coatings, C and C₁ respectively, and is filled as far as
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Fig. 34.—Tube with Filament Rendered Incandescent in an Electrostatic Field.
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Fig. 35.—Crookes' Experiment in Electrostatic Field.
the coatings reach with conducting, and the space above with insulating powder. These coatings are merely used to enable me to perform two experiments with the tube—
