1995 年 37 巻 6 号 p. 291-300
The measurements of optical activity of solids were unfeasible for more than 170 years since its discovery in 1811, due to coexisting large birefrinigences. We developed an optical apparatus named HAUP (high accuracy universal polarimeter), which enabled us to measure simultaneously optical activity, birefringence and rotation of indicatrices of any crystals, even belonging to the monoclinic and triclinic systems. The outstanding features of the HAUP are explained first. The indispensable utility of optical activity in researches in material sciences is demonstrated by showing our results obtained by the HAUP.