The Phonogram, Vol. 2: A Monthly Magazine Devoted to the Science of Sound and Recording of Speech, April-May, 1892 (Classic Reprint) - Tapa dura

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Excerpt from The Phonogram, Vol. 2: A Monthly Magazine Devoted to the Science of Sound and Recording of Speech, April-May, 1892

Based on a. Discharge of Three Amperes, a. Phonograph in good order takes Two and One Half Amperes.

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