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Woad flower
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• 1811 : Works on woad cultivation as a substitute for indigo, scarce because of the Continental System.
• 1816 : A year before their patent’s expiration, Claude leaves Chalon-sur-Saône for Paris, then England in 1817 to try to exploit their invention.
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• 1816 to 1818 : Left alone, Nicephore begins research on the fixation of projected images on the back of camerae obscurae.First experiments -- first failures. He searches for quarries of calcareous stone around Chalon-sur-Saône to find stones appropriate for lithography.
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• 1818 : An image remains stable (fixed) for three months.
Nicephore builds himself a dandy horse that he improves with an adjustable saddle.
• 1822 : Realisation of the copy of a drawing by the single action of light on a glass plate coated with Judea bitumen (portrait of the Pope Pius VII).
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Niépce's "draisienne"
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Cardinal d'Amboise
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• 1823 : Reproduction of drawings by contact on Judea bitumen varnish
• 1824 : Achieves “Points of view with the camera obscura “ (photographs) on lithographic stones.The exposure time is about five days.
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