Hermann Sprengel FRS (29 August 1834 – 14 January 1906) was a German-British chemist who discovered the explosive nature of picric acid in 1873, patented safety explosives and invented the mercurial air pump.

Life

He was born at Schillerslage, near Hanover, on 29 August 1834.Sprengel was the son of George Sprengel.He was

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