![Optics: crystals exhibiting interference colours. Colour mezzotint [?] by R.H. Digeon, ca. 1883, after J. Silbermann.](https://iiif.wellcomecollection.org/image/V0025370EL/full/282%2C/0/default.jpg)
![Optics: crystals exhibiting interference colours. Colour mezzotint [?] by R.H. Digeon, ca. 1883, after J. Silbermann.](https://iiif.wellcomecollection.org/image/V0025371/full/282%2C/0/default.jpg)
![Optics: colour scales for violet and yellow. Colour mezzotint [?] by R.H. Digeon, ca. 1868, after J. Silbermann.](https://iiif.wellcomecollection.org/image/V0025372/full/282%2C/0/default.jpg)
Catalogue
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Optics: spectra of various gases. Colour aquatint by R.H. Digeon, ca. 1883.
Date: 1883Reference: 47498i
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- Online
Optics: spectra of various substances. Colour aquatint (?) by R.H. Digeon, ca. 1868.
Date: 1868Reference: 47054i
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- Online
Meteorology: a double rainbow. Colour lithograph by R.H. Digeon, 1868, after E. Ronjat.
Ronjat, Etienne Antoine Eugène, 1822-Date: 1868Reference: 46623i- Pictures
Optics: emission spectra of various metals. Colour aquatint by R.H. Digeon, ca. 1883.
Date: 1883Reference: 47499i
- Pictures
- Online
Optics: crystals exhibiting interference colours. Colour mezzotint by R.H. Digeon, ca. 1868, after J. Silbermann.
Silbermann, J.Date: 1868Reference: 47056i