This article was originally published with the title “ The Invention of the Electric Light ” in Scientific American Magazine Vol. 201 No. 5 (November 1959), p. 98 doi:10.1038 ...

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In the introduction to his patent 12 entitled 'Light Relay', which was filed in 1927 and granted on 31 December 1929, he wrote: “The proposed invention uses the known phenomenon of luminescence ...