neously. A hoopfilled with grindings is pushed from below the hopper to be- Fig 5. southwest of England, has a cylindrical stone, weighing one ortwo tuns, and rotating in an annular trough of masonry.The axis of the stone is connected by arms to a sweep, whichis pivoted on a central post, and…
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![An illustration from M. Vitrvvii De architectvra libri decem : nuper maxima diligentia castigati atq[ue] excusi : additis Iulij Frontini De aqueductibus libris propter materiae affinitatem (1522)](https://img.insideoutlibrary.com/img/200/ia-mvitrvviidearchi00vitr-352-123.webp)
