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Leaving on one side the manifold but purely electrical consequences of this and the numerous researches relating to the production or to the properties of the waves some of which, those of MM. Sarrazin and de la Rive, Righi, Turpain, Lebedeff, Decombe, Barbillon, Drude, Gutton, Lamotte, Lecher, etc., are, however, of the highest order I shall only mention here the studies more particularly directed to the establishment of the identity of the electromagnetic and the luminous waves.
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