Voltaic battery (pile): this was made up of a disc of zinc, a disc of copper, a disc of cloth moistened with acid, then a disc of zinc and so on. Each contact between zinc and copper formed a 'couple'. From A Ganot "Natural Philosophy", London 1887. Engra
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Keywords: ., /, 1887., 19th, :, acid, battery, century, chemistry, cloth, contact, copper, couple., disc, electricity, engra, formed, ganot, london, moistened, natural, philosophy, storage, voltaic, wet, zinc