Joseph Proust
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Joseph Louis Proust was a French chemist. He was best known for his discovery of the law of definite proportions in 1797, stating that chemical compounds always combine in constant proportions.
Portrait of Louis Proust. Wellcome L0006972
Jean-François Pilâtre de Rozier was a French chemistry and physics teacher, and one of the first pioneers of aviation. He made the first crewed free balloon flight, and first confirmed human flight of
Joseph Proust
…in his father's shop and later went to Paris where he gained the appointment of apothecary in chief to the Salpêtrière. He also taught chemistry with Pilâtre de Rozier, a famous aeronaut. Under Carlos IV's influence Proust went to Spain. There he taught at the Chemistry School in Segovia and at the University of…
Pilatre de Rozier
The first tethered balloon ascent on 15 October 1783 by Rozier
The first untethered balloon flight, by Rozier and the Marquis d'Arlandes on 21 November 1783.
Fatal accident at Wimereux, 15 June 1785.