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Thus about fifty years ago OErsted, of Copenhagen, discovered the deflection of a magnetic needle by an electric current; and about the same time Thomas Seebeck, of Berlin, discovered thermoelectricity. These great discoveries were soon afterwards turned to account, by Nobili and Melloni, in the construction of an instrument which has vastly augmented our knowledge of radiant heat.
For example, if we could establish the truth of what up till now is only a conjecture, namely, that it is the action of the sun which produces thermoelectricity at the equator; that this produces terrestrial magnetism; and that this magnetism, again, is the cause of the aurora borealis, these would be truths externally of great, but internally of little, significance.
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