Glossary
Birefringence
The property of all stones, except those of the cubic crystal system (diamond, garnet and spinel), to divide a passing ray of light in two.
Also known as double refraction.
Related theme:
Research
Research
For research into the first Rieussec chronographs, the Fondation de la Haute Horlogerie wishes to locate this piece, made between 1820 and 1830.