Stock Photo: Ore which has been broken up in a stamping mill being reduced further by passing through a grinding mill. The mill is driven by a water wheel, out of the picture to right, through axle, A. Told and tin ore were treated in this way. From De re metallica by Agricola, pseudonym of Georg Bauer (Basle

Stock Photo: 1746-1919 Ore which has been broken up in a stamping mill being reduced further by passing through a grinding mill.  The mill is driven by a water wheel, out of the picture to right, through axle, A.  Told and tin ore were treated in this way. From De re metallica  by Agricola, pseudonym of Georg Bauer (Basle