A fascinating astro photograph of the eclipse on April 17, 1912 in Paris. The typical glass positive of "Vérascope Richard" isn't used as a stereo image. The solar eclipse is visible on the left. On the right the photographic setup.
Technical information about the image is written in blue pen on the glass plate between the images.

ca. 4,5 x 10,7 cm

Historical detail about this solar eclipse:
Eugène Atget photographed a crowd gathering at the Place de la Bastille in Paris on April 17, 1912, using viewing equipment to observe a solar eclipse. A famous image used on the cover of La Révolution Surréaliste.