1641 in science

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The year 1641 in science and technology involved some significant events.

Technology

• The sealed thermometer is developed with Ferdinand II, Grand Duke of Tuscany, using a glass tube containing alcohol, which freezes well below the freezing point of water.
• Samuel Winslow is granted the first patent in North America by the Massachusetts General Court for a new saltmaking process.

Births

• March - Menno van Coehoorn, Dutch military engineer (d. 1704)
• July 30 - Regnier de Graaf, Dutch physician and anatomist who discovered the ovarian follicles, which were later named Graafian follicles (d. 1673)
• September 26 - Nehemiah Grew, English botanist and physician who made some of the early microscopical observations of plants (d. 1712)

Deaths

• January 3 - Jeremiah Horrocks, English astronomer (b. 1618)
• March 8 - Xu Xiake, Chinese explorer and geographer (b. 1587)
• Guy de La Brosse, French physician and botanist (b. c.1586)