Three devices for ventilating mines with bellows. In the centre the horse turns the wheel and cams, I,I, work the bellows. At the top, a horse turns a crown wheel which engages with a lantern on the camshaft and the cams engage with tappets to work the bellows. At the bottom, a man works the bellows by foot. From 'De re metallica', by Agricola, pseudonym of Georg Bauer (Basle, 1556). Woodcut. Photo via Newscom
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達志影像
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