English: Figure V and VI from Ottonis De Guericke Experimenta Nova (ut vocantur) Magdeburgica De Vacuo Spatio, Amstelodami: Janssonius, 1672, p. 148, showing Guericke's experiments with the sulfur globe.
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Ottonis De Guericke Experimenta Nova (ut vocantur) Magdeburgica De Vacuo Spatio, Amstelodami: Janssonius, 1672