1723 in science

none 1723 science 1723 The year 1723 in science and technology involved some significant events. Geophysics George Graham discovers diurnal variation in Earth's magnetic field.Graham George 1724 An Account of Observations Made of the Variation of the Horizontal Needle at London, in the Latter Part of the Year 1722, and Beginning of 1723 Philosophical Transactions of the Royal Society 33 96–107 10.1098/rstl.1724.0020Graham George 1724 Observations of the Dipping Needle, Made at London, in the Beginning of the Year 1723 Phil. Trans. 33 332–339 10.1098/rstl.1724.0062 free Antoine de Jussieu publishes De l'Origine et des usages de la Pierre de Foudre on the origins of fossils, prehistoric stone tools and meteorites.http://rr0.org/data/1/9/7/8/Westrum_TheCaseOfMeteorites_SocialStudiesOfScience/03/index_fr.html Les pierres de foudre 2011-10-18 Optics Giacomo F. Maraldi makes the first observation of the Arago spot, unrecognized at this time.Hecht Eugene Optics San Francisco Addison Wesley 2002 4th 0-8053-8566-5 494 Births January 5 – Nicole-Reine Lepaute, French astronomer (died 1788) January 31 – Petronella Johanna de Timmerman, Dutch scientist (died 1786) February 17 – Tobias Mayer, German cartographer, astronomer and physicist (died 1762) April 30 – Mathurin Jacques Brisson, French zoologist (died 1806) November 12 – Saverio Manetti, Italian natural historian (died 1785) Deaths August 26 – Anton van Leeuwenhoek, Dutch pioneer of the microscope (born 1632) References Category:18th century in science Category:1720s in science