Three devices for ventilating mines with bellows

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

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1556 Agricola Basle Bauer Bellows Cams Camshaft Devices Engage Engages Metallica Mines Pseudonym Tappets Turns Ventilating Ventillation

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