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Updated: May 20, 2025
This accounts for the fact that the unipolar concept of gravity had eventually to be supplemented by some kind of bipolar concept. Now, the only sphere of nature-phenomena with a bipolar character accessible to the onlooker-consciousness 'was that of electricity.
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.
It is not devoid of interest to note that Erman, a German scholar, once very celebrated and now generally forgotten, drew attention as early as 1815 to the unipolar conductivity of a flame.
Since these phenomena are also least observed in flames rich in oxygen, it appears to be a general law that carbon and hydrogen are more strongly attracted by the negative pole, while oxygen is more attracted by the positive pole, probably like in all polar differentially attractions, in consequence of a peculiar unipolar conductivity of the substances.
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