aving a double chain . Clamps should be fixed to the axle of this machine , just as to the drum of the other one ; some of these are made simple and others with triple curves , but each kind has four barbs . The third machine , which far excels the two just described , is made when a running stream… … A — Wheel whose paddles are turned by the force of the stream . B — Axle . C — Drum of axle , to which clamps are fixed . D — Chain . E — Link . F — Dippers . G — Balance drum . but the drum which is round the axle , the chain , and the balance drum , are like the first machine . It has much more…
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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_000033125008455038-158-104.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_000033125008455038-253-169.webp)
