Mine drainage. Man in centre left of picture is boring lengths of wood with borers and augers to form pipes. Man on centre right is working the piston rod of a suction pump to raise water from a mine.  In the left foreground are lengths of pipe to be joined, and various internal pump parts.  From 'De re metallica', by Agricola, pseudonym of Georg Bauer (Basle, 1556).  Woodcut.