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.

Optics- colour scales for violet and yellow. Coloured process print [?] by R.H. Digeon, ca. 1868, after J. Silbermann.

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