Abstract: The dichrograph and accompanying method are usable for parallel measurement of circular dichroism according to the first harmonic of photoelectric current of the detector, optical rotation according to the second harmonic and transparency according to the null harmonic. It contains the switch (3) of ray, from which alternatively exit two parallel rays--measurement ray (4) and reference ray (5), going through one mutual modulator of ellipticity (6), achromatic phase element (9) which is during calibration of circular unit situated in the reference ray (5). Moreover it contains two analyzers--the measurement analyzer (8) in the measurement ray (4) behind the couvette (7) and the reference analyzer (10) in the reference ray (5). The measurement analyzer (8) has the optical axis turned for 45.degree. same as the modulator (6). The reference analyzer (10) is during measurement turned for unit angle, e.g. for 1.degree., to the measurement analyzer (8).