A compact Tiselius electrophoresis apparatus which incorporates the valuable features of the Tiselius method yet avoids its disadvantages of large size, costliness, and difficulty of operation is described. It incorporates a 2‐ml capacity Tiselius cell, and a highly precise optical system based on Longsworth's scanning modification of the Toepler schlieren method. Two schlieren lenses provide parallel light through the cell and reduce the optic path length. The over‐all dimensions of the self‐contained unit are 63″×14″×12″.

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