with a small quantity of heavy sand , have settled in the trough , they wash in a bowl and collect in bags and carry away with them . Some people wash this kind of sand in a large bowl which can easily be shaken , the bowl being suspended by two ropes from a beam in a building . The sand is thrown…
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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_000033125008455038-285-199.webp)
![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_000033125008455038-368-248.webp)
![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 insertas, adiunctis latinis, germanicis[que] appellationibus ita ob oculos ponuntur, ut clarius tradi non possint : eiusdem de animantibus subterraneis liber, ab autore recognitus, cum indicibus diuersis, quicquid in opere tractatum est, pulchrè demonstrantibus (1556)](https://img.insideoutlibrary.com/img/200/ia-georgiiagricola00agria-288-0.webp)
![An illustration from La gra[n]t nef des folz du mo[n]de .](https://img.insideoutlibrary.com/img/200/ia-lagrantnefdesfol00bran-123-1.webp)
![An illustration from Examen dv livre des Recreations mathematiqves, & de ses problemes en geometrie mechanique, optique & catoptrique [du J. Leurechon] Où sont aussi discutées & restabiles plusieurs experiences physiques y proposées (1639)](https://img.insideoutlibrary.com/img/200/ia-examendvlivredes00mydo-434-92.webp)
