Mirrors made by Prof. Emile Schaer

[Xavier]

Two telescope mirrors made the famous Suisse optician and astronomer Prof. Emile Schaer (1862 - 1931).
The two mirrors are part of heliostat.
The two mirrors are described in "Publications of the Observatoire Geneve Series A, vol. 18, pp.253-265" 1931.
The diameter are 26cm (625cm) and 20cm (300cm).
Emile Schaer is know for the invention of the folded refractor.
The mirrors are signed