Template:Selected anniversaries/September 14: Difference between revisions

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||1637: Pierre Vernier dies ... was a French mathematician and instrument inventor. He was inventor and eponym of the vernier scale used in measuring devices. Pic: device.
||1637: Pierre Vernier dies ... was a French mathematician and instrument inventor. He was inventor and eponym of the vernier scale used in measuring devices. Pic: device.
||1698: Charles François de Cisternay du Fay born ... chemist. He discovered the existence of two types of electricity and named them "vitreous" and "resinous" (later known as positive and negative charge respectively). He noted the difference between conductors and insulators, calling them 'electrics' and 'non-electrics' for their ability to produce contact electrification. He also discovered that alike-charged objects would repel each other and that unlike-charged objects attract. Pic.


File:Giovanni_Cassini.jpg|link=Giovanni Domenico Cassini (nonfiction)|1712: Mathematician, astronomer, and engineer [[Giovanni Domenico Cassini (nonfiction)|Giovanni Domenico Cassini]] dies. He discovered four satellites of the planet Saturn and noted the division of the rings of Saturn; the Cassini Division was named after him.
File:Giovanni_Cassini.jpg|link=Giovanni Domenico Cassini (nonfiction)|1712: Mathematician, astronomer, and engineer [[Giovanni Domenico Cassini (nonfiction)|Giovanni Domenico Cassini]] dies. He discovered four satellites of the planet Saturn and noted the division of the rings of Saturn; the Cassini Division was named after him.

Revision as of 17:44, 31 August 2018