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  • A lapidary, sitting at his foot-operated grinding wheel (above), an elevation and plan of his worktable (below). Engraving by B. L. Prevost after J. N. F. Boucher.
  • A diamond cutters' wheel in use (top), and a plan and perspective of the wheel with various components (below). Etching by Defehrt after L.J. Goussier.