The device comprises a housing 16, having an annular chamber 18, the outer walls whereof are connected with conduits 10 and 12 to feed the liquids to be mixed; and the inner walls whereof with radial, conical conduits 24 and 26 which are perpendicular to the first mentioned conduits and which lead into a central chamber 28. Said central chamber 28 communicates by assymetric conduits 48, 50 with observation cell 40.
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