Edmond Becquerel, Spectres solaires, 1848, images photochromatiques, musée Nicéphore Niépce, Chalon-sur-Saône. (IMAGE)

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Edmond Becquerel, Spectres solaires, 1848, images photochromatiques, musée Nicéphore Niépce, Chalon-sur-Saône.

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Edmond Becquerel, Spectres solaires, 1848, images photochromatiques, musée Nicéphore Niépce, Chalon-sur-Saône.

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Edmond Becquerel, Spectres solaires, 1848, images photochromatiques, musée Nicéphore Niépce, Chalon-sur-Saône.

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