1691 in science

	… 1681; 1682; 1683; 1684; 1685; 1686; 1687; ; 1688; 1689; 1690; 1691; 1692; 1693; 1694; ; 1695; 1696; 1697; 1698; 1699; 1700; 1701 …;
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The year 1691 in science and technology involved some significant events.

Astronomy

Italian Jesuit scholar Filippo Bonanni publishes the results of his microscopic observations of invertebrates in Observationes circa Viventia, quae in Rebus non-Viventibus.

Anton Nuck's Adenographia curiosa et uteri foeminei anatome nova is published at Leiden, including a description of the canal of Nuck[1] and a demonstration that the embryo is derived from the ovary and not the sperm.[2]

Edmond Halley devises a diving bell.[3]
In music, the "equal temperament scale" used in modern music is developed by organist Andreas Werckmeister.

January 17 – Richard Lower, English physician who performed the first direct blood transfusion (born 1631)
December 31 – Robert Boyle, Anglo-Irish chemist (born 1627)[4]

Enersen, Ole Daniel. "Nuck's canal". Whonamedit?. Retrieved 2012-10-15.
Speert, Harold (1958). Obstetric and Gynecologic Milestones. New York: Macmillan. pp. 95–101.
Edmonds, Carl; Lowry, C.; Pennefather, John. "History of diving". South Pacific Underwater Medicine Society Journal. 5 (2). Archived from the original on 2010-10-14. Retrieved 2011-06-17.
"Robert Boyle | Biography, Contributions, Works, & Facts". Encyclopedia Britannica. Retrieved 4 December 2020.

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