alb1656141

Mine ventilation shaft

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.  (Photo by: Universal History Archive/UIG via Getty Images).
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Título:
Mine ventilation shaft
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. (Photo by: Universal History Archive/UIG via Getty Images)
Crédito:
Album / Universal Images Group / Universal History Images \ UIG
Autorizaciones:
Modelo: No - Propiedad: No
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Tamaño imagen:
4737 x 4427 px | 60.0 MB
Tamaño impresión:
40.1 x 37.5 cm | 15.8 x 14.8 in (300 dpi)