1631 in science

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The year 1631 in science and technology involved some significant events.

Geology

• Mount Vesuvius erupts for the only time this century.

Mathematics

• William Oughtred publishes Clavis Mathematicae, introducing the multiplication sign (×) and proportion sign (::).
• Some of Thomas Harriot's writings on algebra are published posthumously as Artis Analyticae Praxis.

Technology

• Earliest known bentside spinet, made by Hieronymus de Zentis.

Births

• Richard Lower, English physician who performed the first direct blood transfusion (died 1691)
• approx. date – William Ball, English astronomer (died 1690)

Deaths

• October 20 – Michael Maestlin, German astronomer and mathematician (born 1550)
• December 10 – Sir Hugh Myddelton, Welsh-born goldsmith and hydraulic engineer (born c. 1560)