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(1772-04-25): The Duc de Croy sees Lavoisier, Macquer and Cadet at work on the diamond experiment in Cadet's laboratory.
Journal inédit du Duc de Croy. 1718-1784 (edited by E.H. de Grouchy and P. Cottin, Paris, 1906-7, vol. 3, p. 19
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(1772-08-14) (1772-08-17): Experiment on the large burning glass of the Tour d'Auvergne and with the lens of the Académie (called the burning glass of the Palais Royal, built by Tschirnhaus).
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(1772-09-10): Experiment on the absorbtion of air by the combustion of phosophorous
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