A method and apparatus for gravimetrically separating particles of different sizes and densities. A conical, liquid filled vat is closed at its smaller bottom opening by a rigid, flexibly mounted diaphragm and at its larger top opening by a flexibly mounted filter bed having a permeable bottom. The diaphragm and bed are rigidly connected and reciprocably driven along a vertical axis. The differential liquid flow promotes the migration of denser particles through the bed and into the vat.
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