Image: Humboldt gasmask 1799
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Description: Humboldt's first gasmask
Title: Humboldt gasmask 1799
Credit: English Wikipedia; scanned from: HUMBOLDT, Alexander von. Ueber die unterirdischen Gasarten und die Mittel ihren Nachtheil zu vermindern. Ein Beytrag zur Physik der praktische Bergbaukunde. Braunschweig, Friedrich Vieweg, 1799. 8vo. With 3 engraved folded plates.
Author: Alexander von Humboldt
Permission: public domain
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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