Inflation of Charles and the Robert brothers' hydrogen balloon, 1783 (c1807). Jean and Noel Robert helping Jacques Charles (1746-1823) to inflate the balloon with hydrogen produced by covering a barrel of iron filings with sulphuric acid. On 1 December 1783 Charles and one of brothers made the first manned ascent in a hydrogen balloon, lifting off from the Tuileries Gardens in Paris.
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