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DescriptionGravity cell.gif	English: Engraving of a gravity cell from the Cyclopedia of Telegraphy and Telephony, published in 1919. Español: Grabado de una celda de gravedad o pila Daniell, modificada por Pallaud hacia 1860,tomado de Cyclopedia of Telegraphy and Telephony, publicada en 1919.
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2007-01-03 12:13 Kurzon 553×700× (68142 bytes) Engraving of a gravity cell from the Cyclopedia of Telegraphy and Telephony, published in 1919.