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Who Invented Radio: Guglielmo Marconi or Aleksandr Popov? - IEEE Spectrum
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One of the first radio receivers, built by Russian physicist Alexander Popov as a lightning detector in 1894 Stock Photo - Alamy
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An electrolytic detector, a primitive device used to demodulate radio waves in early radio receivers around the turn of the century. It consists of a metal cup containing a dilute solution of
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Detector (radio) - Wikipedia
Detektor Radio Telefunken E5G, 1916
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Detector (radio) - Wikipedia
Crystal Galena Radio DETEFON T-7 -------- Detektor Empfanger | #1813090957
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Schiebespulen-Detektor Crystal Radio-Funken KG, Brandt & Baetz;
