Mine ventilation shaft topped with a device to extract the stale air from the mine. H is a vane to make the barrel revolve so that is always facing in the optimum wind direction. From De re metallica, by Agricola, pseudonym of Georg Bauer (Basle, 1556). Woodcut.

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TOP09159515

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達志影像

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RM

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須由TPG 完整授權

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