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Updated: May 6, 2025
Why principally the negative flame returns may be explained in two ways either the point of the flame loses much by radiation, or the base of the flame is a bad conductor. The former explanation would agree with the experiments made by Wiedemann and Ruhlmann, the latter with Erdman's theory of unipolar conductivity of flames.
Our confrere Ruhlmann, of the Elektrotechnische Zeitschrift, gives a still more remarkable example yet of such confusion.
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