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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Faraday as a Discoverer by John Tyndall: 'abnormal'; crystalline, amorphous, and compressed, was compared
with that of crystalline, amorphous, and compressed diamagnetic
bodies; and by a series of experiments, executed in the laboratory
of this Institution, the most complete antithesis was established
between magnetism and diamagnetism. This antithesis embraced the
quality of polarity,--the theory of reversed polarity, first
propounded by Faraday, being proved to be true. The discussion of
the question was very brisk. On the Continent Professor Wilhelm
Weber was the ablest and most successful supporter of the doctrine
of diamagnetic polarity; and it was with an apparatus, devised by
him and constructed under his own superintendence, by Leyser of
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