312 Scientific American OCTOBER 30 1909. Apparatus for demonstrating current effects. Apparatus for the study of natural and permanent magnets and terrestrial magnetism. Apparatus for the study of radiation phenomena., -1909-10-30
312 Scientific American OCTOBER 30 1909. Apparatus for demonstrating current effects. Apparatus for the study of natural and permanent magnets and terrestrial magnetism. Apparatus for the study of radiation phenomena., -1909-10-30
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