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César L M Des Graz was Secretary to the Commandant of the ASTROLABE on the voyage, 1837-1840.
In 1836 Emperor Louis Philippe of France wanted France to play a part in the exploration of the Southern Seas. Dumont d'Urville in ASTROLABE would lead and would be accompanied by another ship LA ZELEE captained by Charles Hector Jacquinot. Seven scientists accompanied the crews on the voyage. The ships left Toulon 7 Sep 1837, the aim to locate the southern magnetic pole. On 22 Jan 1838 the ships came across Antarctic ice in the Antarctic peninsula region. They sailed across the Pacific in more temperate and tropical climes before heading south again to Tasmania arriving in November 1839. They set sail for Antarctica once again on 1 Jan 1840 and on the 19th sighted a part of the continent where the first ever landing on continental Antarctica was made. They determined the approximate position of the southern magnetic pole before heading back to Tasmania and New Zealand arriving back in Toulon France on 7 Nov 1840.