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Stock Photo: Draining a mine by means of a suction pump. The man in the top right of the picture is operating the piston of the pump by raising and lowering the opposite end of the beam to which the piston rod is attached. From De re metallica, by Agricola, pseudonym of Georg Bauer (Basle, 1556) Woodcut
Stock Photo: 1746-1904 Draining a mine by means of a suction pump.  The man in the top right of the picture is operating the piston of the pump by raising and lowering the opposite end of the beam to which the piston rod is attached. From De re metallica, by Agricola, pseudonym of Georg Bauer (Basle, 1556) Woodcut