On the left, diagram of a voltaic pile (ancestor of the electrical pile) invented by the Italian physicist Alessandro Volta in 1800. On the right, diagram of Volta's 'Crown of cups' pile, with glass vases arranged in a circle and filled with sulphuric acid. Illustration from "Les Merveilles de la science ou description populaire des inventions modernes" written by Louis Figuier and published in 1867 by Furne, Jouvet et Cie.

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Keywords: 19th, century, circle, column, development, drawing, electricity, engraving, illustration, invention, physics, progress, scientific, storage, technical, technology