1691 in science
The year 1691 in science and technology involved some significant events.
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Astronomy
- The Hartmann Mask is invented by Christopher Scheiner.
Mathematics
- Gottfried Leibniz discovers the technique of separation of variables for ordinary differential equations.
- Michel Rolle invents Rolle's theorem.
Medicine
Technology
- Edmond Halley devises a diving bell.[3]
- In music, the "equal temperament scale" used in today's music is developed by organist Andreas Werckmeister.
Births
- November 18 – Mårten Triewald, Swedish mechanical engineer (died 1747)
Deaths
- January 17 – Richard Lower, English physician who performed the first direct blood transfusion (born 1631)
- December 31 – Robert Boyle, British chemist (born 1627)
gollark: This is actually somehow really accurate.
gollark: True engineers approximate the pendulum time period formula $T=2\pi \sqrt{\frac{l}{g}}$ as $T=2\sqrt{l}$.
gollark: So basically just "optics but we are HIGHLY engineer-like and use the small angle approximation".
gollark: According to Wikipedia, which I just checked, which makes me an expert,> Gaussian optics is a technique in geometrical optics that describes the behaviour of light rays in optical systems by using the paraxial approximation, in which only rays which make small angles with the optical axis of the system are considered. In this approximation, trigonometric functions can be expressed as linear functions of the angles. Gaussian optics applies to systems in which all the optical surfaces are either flat or are portions of a sphere. In this case, simple explicit formulae can be given for parameters of an imaging system such as focal length, magnification and brightness, in terms of the geometrical shapes and material properties of the constituent elements.
gollark: Fearsome.
References
- 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). Retrieved 2011-06-17.
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