Model: HO gauge. An impregnation kettle, finished model painted.Prototype: An impregnation kettle is used to impregnate wood with tar oil under high pressure, for example. In the old method (Rüpping method), the wood is enclosed in a vessel, which is then filled with compressed air. The wood is then soaked with heated tar oil under increased pressure. After the pressure is released, the air pressed into the wood expands and expels the tar oil that has not been absorbed by the wood cells, which i

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