- 1691 in science
The year 1691 in
science andtechnology involved some significant events.Astronomy
* The
Hartmann Mask is invented byChristopher Scheiner , although most people know of it as a Hartmann Mask not a Scheiner Mask.Exploration
Mathematics
*
Michel Rolle inventsRolle's theorem .Physics
Technology
* In music, the "equal temperament scale" used in today's music is developed by
organist Andreas Werkmeister .Births
Deaths
*
December 30 -Robert Boyle , a founder of modernchemistry (* 1627)
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