Various models of thermopile from 1830. Fig. 349: model developed by M. Pouillet in which the soldered joints are alternately immersed in hot water or ice Fig. 350: component of Nobili's pile Fig. 351: Nobili's model in which operation depends on heating one side of the pile Fig. 352: Nobili's model with an articulated foot and a reflector 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, development, drawing, electricity, engraving, france, french, illustration, invention, italian, italy, physics, progress, scientific, storage, technical, technology, thermopile