Letter of François Arago written to Louis de Freycinet, 1820 Nov. 24 [manuscript]. 
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Cartographic surveyor and naturalist. In 1800 Louis de Freycinet joined an expedition under Nicolas Baudin to explore the south and south-west coasts of Australia in the ships Naturaliste and Geographe. He commanded an expedition to circumnavigate the globe and conduct research into the shape of the Earth, meteorology and terrestrial magnetism, sailing from Toulon in September 1817 in L'Uranie with his wife Rose, who secreted herself aboard. He set up an observatory at Shark Bay and charted the ...
French mathematician, physicist, astronomer and politician. François Arago contributed to major discoveries concerning electromagnetism, light polarisation and velocity, the meridian arc length of the earth, and the standardisation of the metric system. From 1830 he was director of the Paris Observatory. Arago also served several roles in government, including a short period as the prime minister of France. From the description of Letter of François Arago written to Louis de Freyci...