Stock Photo: Ventilating a mine. Various forms of fan which could be mounted on an axle inside a ventilating drum. A) Thin boards forming paddles. B) Short boards with feather shaped pieces of supple wood fixed on them. C) Short boards fitted with goose feathers., From De re metallica, by Agricola, pseudonym of

Ventilating a mine. Various forms of fan which could be mounted on an axle inside a ventilating drum. A) Thin boards forming paddles. B) Short boards with feather shaped pieces of supple wood fixed on them. C) Short boards fitted with goose feathers., From De re metallica, by Agricola, pseudonym of  : Stock Photo

1746-1908 | Rights Managed
Credit: World History Archive / World History Archive
Category: Illustrations
009593-p

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Property Release: No

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