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Bell Homestead, National Historic Site

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Pidato Bell di hadapan American Association for the Advancement of Science di Boston padha 27 Agustus 1880, menghadirkan fotopon. Dimuat sebagai "On the Production and Reproduction of Sound by Light" di American Journal of Sciences, Third Series, vol. XX, #118, Oktober 1880, hh. 305 - 324; dan sebagai "Selenium and the Photophone" di Nature, September 1880