Pulfrich refractometer

unsigned, but made by Max Wolz, Bonn
Brass and black painted cast iron Pulfrich type refractometer (height 30 cm, circle diameter 12 cm).
Unsigned, but made by Max Wolz, Bonn, late 19th century.

collection: Museum for the History of Sciences, Universiteit Gent, Belgium (inventory number: MW 93/13)