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Page:Experiments with alternate currents of high potential and high frequency (Tesla).djvu/131

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113

only just enough to allow the discharge to pass through, and the space between the bulbs appeared crimson, producing a curious effect. In some cases, when the exhaustion in globe L was very low, and the air good conducting, it was found necessary, in order to bring the button m to

Fig. 29.—Lamp with Independent Auxiliary Bulb.

high incandescence, to place, preferably on the upper part of the neck of the globe, a tinfoil coating which was connected to an insulated body, to the ground, or to the other terminal of the coil, as the highly conducting air weak-