ttom is made of iron wire netting , and fastened with wire to two iron rods , which are fixed to the two side planks . This bottom has openings , through which broken rock of the size of a hazel nut cannot pass ; the pieces which are too large to pass through are removed by the workman , who again… … A Box LAID flat on the ground . B — Its bottom which is made of iron wire . C Box INVERTED . D — IRON RODS . E — BOX SUSPENDED FROM A BEAM , THE INSIDE BEING VISIBLE . F — BOX SUSPENDED FROM A BEAM , THE OUTSIDE BEING VISIBLE .
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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_000033125008455038-242-158.webp)
![An illustration from Cosmographey oder beschreibung aller Länder/ Herrschafften/ fürnem[m]sten Stetten/ geschichten/ gebreüchen/ handtierungen, [et]c. (1574)](https://img.insideoutlibrary.com/img/200/heidelberg-muenster1574-820-1.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_000033125008455038-289-203.webp)
