Optics: spectra of various substances. Coloured process print by R.H. Digeon, ca. 1868.
- Digeon, René Henri, active 1866-1872.
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About this work
Spectres de diverses sources lumineuses, solaire, stellaires, métalliques, gazeuses, électriques. ; R.H. Digeon sc.
1 print : process print, printed in colours ; image 18.1 x 12 cm
Wellcome Library no. 47054i