"Crossed dispersion in a monoclinic crystal p>v." -Johannsen, 1908

Crossed Dispersion

"Crossed dispersion in a monoclinic crystal p>v." -Johannsen, 1908

"Horizontal dispersion in a monoclinic crystal. p<v." -Johannsen, 1908

Horizontal Dispersion

"Horizontal dispersion in a monoclinic crystal. p