Optics- spectra of various gases. Coloured process print by R.H. Digeon, ca. 1883. - from our story 'Le Monde Physique : Illustrating Scientific Phenomena Beautifully (1881)'

Optics- spectra of various gases. Coloured process print by R.H. Digeon, ca. 1883.

Optics- spectra of various gases. Coloured process print by R.H. Digeon, ca. 1883.

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