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The Barometer. Evangelista Torricelli became the first scientist to create a sustained vacuum and to discover the principle of a barometer. Torricelli realized that the variation of the height of the mercury from day to day was caused by changes in the atmospheric pressure.
From these last facts, Spallanzani was led to regard the luminous matter as a compound of hydrogen and carburetted hydrogen gas. The Book of Curiosities I. Platts Spallanzani placed fluids, which easily became putrid, in glass tubes, which he then hermetically sealed and boiled.