This late example of a wind-driven Archimedes screw-pump shifted brine from one salt concentrating pond to one of higher salinity in the long-used process of recovering salt by solar evaporation. The screw-pump concept was attributed to Archimedes (287–212 B.C.), and the windmill drive on the pump shaft originated in Holland before 1600. Andrew Oliver, founder of the Oliver Salt Company, which was absorbed by the Leslie Salt Co. in 1936, designed this version of the wind-driven Archimedes screw-pump. Restored to working condition by Donald Holmquist, it represents a mechanically simple method used for more than a century in the San Francisco Bay Area, from about 1820 to 1930.