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The rotation of the molecules in a nematic liquid crystal is studied after rotating the axis of the aligning magnetic field. The process of realignment is observed by doping the liquid crystal with an electrolyte and measuring the cross voltage U* which is induced perpendicular to the applied electric field. The resulting cross voltages are compared with the stationary values and it can be shown that the degree of order with respect to the rotating director remains almost constant. Therefore, the time dependence of the angle 0 between director and magnetic field can be calculated from the measured cross voltage using the steady state equation U* = U*(Φ) . Φ(t) satisfies the formula

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Zur Geschwindigkeit der Ausrichtung nematischer Flüssigkeiten durch Magnetfelder / Kinetics Of Alignment Of A Nematic Liquid Crystal In Magnetic Fields /: Eine Methode zur Bestimmung der Rotationsviskosität γ 1  /