A, B, C, D, E —Five waxed circles of the orbis . F —Opening of same. G —Screw. H —Perforated iron.
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De re metallica / Georg Agricola. Transl. from the 1. latin ed. of 1556 ... by Herbert Clark Hoover ...
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A, B, C, D, E —Five waxed circles of the orbis . F —Opening of same. G —Screw. H —Perforated iron.