
Hypatia Hypatia of
Alexandria was a philosopher, mathematician, and teacher who was born 370 A.D.
She lived in Hypatia of Several works
on mathematics and astronomy are attributed to her, including commentaries on Diophantus's
Arithmetica, as well as on Apollonius's Conics and on Ptolemy's works, but none of
them have survived. Her main
interest was practical technology which led to her contributions to science
which are reputed to include the invention of the astrolabe,
which is a navigational instrument, used until the sextant was invented in the
16^{th} century. It consisted of a pair of rotating discs made of
openwork metal, rotating one on top of the other around a removable peg. She
perfected the device to the point where it could accurately solve problems in
spherical astronomy. A 16^{th} century astrolabe, used to measure
the positions of the sun and stars and to calculate the ascendant sign
of the zodiac Hypatia also
developed the so called hydrometer (hydroscope). It was an instrument used for determining
the specific gravity of liquids. Hydrometer Reference
for the contents above and further information of Hypatia’s live: http://www.inventions.org/culture/female/hypatia.html http://en.wikipedia.org/wiki/Hypatia_of_Alexandria Ziegenbalg J.: Algorithmen, von
Hammurapi bis Gödel; Spektrum Akademischer Verlag Further
information on the hydrometer and the astrolabe: http://en.wikipedia.org/wiki/Hydrometer http://en.wikipedia.org/wiki/Astrolabe 
