Note 3 — INTRODUCTION.
Elizabeth Emma Proby Hamilton translation
In Faraday's induced dissymmetry the ray, having once passed through the body under magnetic influence, has its rotation doubled, instead of neutralised, as in the case of quartz, on being reflected back through the body. Marbach has discovered that chlorate of soda produces circular polarisation in all directions through the crystal, while in quartz it occurs only in the direction of the axis. Marbach also discovered facets upon his crystals, resembling those of quartz.