A — Fireplace . B — Mouth of fireplace . C — Caldron . D — Posts sunk into the ground . E — Cross - beams . F — Shorter bars . G — Iron hooks . H — Staples . I — Longer bars . K — Iron rod bent to support the caldron .
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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_000033125008455038-460-289.webp)
