Chemical effects of the induction spark. Fig. 396: vacuum in an "electric egg" in which two lights are produced, one violet and the other red Fig. 397: the light produced in the electric egg divides into parallel layers: this is the stratification process 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, electromagnetism, engraving, experience, illustration, induction, invention, light, magnetism, observations, physics, progress, science, scientific, technical