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Johann Georg Tralles (October 15, 1763 – November 19, 1822) was a German mathematician and physicist. He was born in Hamburg, Germany and was educated at the University of Göttingen beginning in 1783. He became a professor at the University of Bern in 1785. In 1810, he became a professor of mathematics at the University of Berlin. In 1798 he served as the Swiss representative to the French metric convocation, and was a member of its committee on weights and measures. An iron "committee" meter, a duplicate of the prototype archive meter, was then given as a gift to Ferdinand Rudolph Hassler. From 1803 until 1805 these two men worked together on a topological survey of the Canton of Bern. He was the inventor of the ''alcoholometer'', a device for measuring the amount of alcohol in a liquid. He died in London, England. The crater Tralles on the Moon is named after him, as is the ''alcoholometer'' he invented. ==Bibliography== * "Der erste Ordinarius für Mathematik an der Universität Berlin", Eine Edition seiner Antrittsvorlesung, 1810. * "Beytrag zur Lehre von der Elektrizität" Bern, Haller, 1786 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Johann Georg Tralles」の詳細全文を読む スポンサード リンク
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