Figure 2560 depicts a vacuum drying apparatus for explosive substances, and figure 2561 show a vacuum drying oven made of wrought iron with lead sealing rings.
“Vacuum-Trockenapparat.” In Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]. Leipzig, Germany: P. Schimmelwitz, 1902. https://digital.sciencehistory.org/works/5m60qr961.
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