feet high and three feet in diameter , bound with wooden hoops ; it has a square blow - hole always open , which catches the breezes and guides them down either by a pipe into a conduit or by many pipes into the shaft . To the top of the upper pipe is attached a circular table as thick as the…
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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_000033125008455038-179-117.webp)
