Furnace, boilers and water level in the boiler of a steam engine. 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, 19th-century, boiler, century, coal, development, drawing, engraving, france, french, heat, illustration, industrial, invention, machine, man, mechanisation, operation, oven, progress, revolution, scientific, steam, technical, tools, watching, wheelbarrow, worker