, is made of iron wire netting . They place this on two small cross - planks fixed upon a post set in the ground . Some do not fix the post in the ground , but stand it on the ground until there arises a heap of the material which has passed through the sieve , and in this the post is fixed . With… … A — Sieve . B — Small planks . C — Post . D — Bottom of sieve . E — Open box . F — Small cross - beam . G — Upright posts . order that by this movement the dust , fine and coarse sand , small stones , and fine broken rock may fall through the bottom . Others do not use a sieve , but an open box ,…
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![An illustration from Georgii Agricolae De re metallica : libri XII. Quibus officia, instrumenta, machinae, ac omnia deni[que] ad metallicam spectantia, non modo luculentissimè describuntur, sed & per effigies, suis locis infertas, adiunctis latinis, germanicis [que] appellationibus ita ob oculos ponuntur, ut clarius tradi non possint. ; Eiusdem De animantibus subterraneis liber, (1556)](https://img.insideoutlibrary.com/img/200/ia-gri_000033125008455038-290-204.webp)
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![An illustration from Georgii Agricolae De re metallica : libri XII. Quibus officia, instrumenta, machinae, ac omnia deni[que] ad metallicam spectantia, non modo luculentissimè describuntur, sed & per effigies, suis locis infertas, adiunctis latinis, germanicis [que] appellationibus ita ob oculos ponuntur, ut clarius tradi non possint. ; Eiusdem De animantibus subterraneis liber, (1556)](https://img.insideoutlibrary.com/img/200/ia-gri_000033125008455038-289-203.webp)