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De re metallica (1912)

Agricola, Georg, Hoover, Herbert · leaf 318

An illustration from De re metallica, 1912, leaf 318
BOOK VIII . 274 … A — Area . B — Wood . C — Ore . D — Cone - shaped piles . E — Canal . same ore is soaked with water and smeared over it and beaten on with shovels ; some workers , if they cannot obtain such fine sand , cover the pile with char coal - dust , just as do charcoal - burners . But at Goslar , the pile…

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