Optics- colour scales for violet and yellow. Coloured process print [?] by R.H. Digeon, ca. 1868, after J. Silbermann.
- from our story 'Le Monde Physique : Illustrating Scientific Phenomena Beautifully (1881)'
Optics- colour scales for violet and yellow. Coloured process print [?] by R.H. Digeon, ca. 1868, after J. Silbermann.