A — Crane - post . B — Socket . C — Oak cross - sills . D — Band . E — Roof - beam . F — Frame . G — Lower small cross - beam . H — Upright timber . I — Bars which come from the sides of the crane - post . K — Bars which come from the sides of the upright timber . L — Rundle drums . M — Toothed…
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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_000033125008455038-397-261.webp)
