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Jean Alexander Heinrich Clapier de Colongue
Jean Alexander Heinrich Clapier de Colongue ((ロシア語:Ivan Petrovich de Collong; Иван Петрович де-Колонг); (ラトビア語:Johans Aleksandrs Heinrihs Klapje de Kolongs)) (–) was a Baltic German marine engineer and founder of a theory of magnetic deviation for magnetic compasses, living and working in Imperial Russia.
Ivan Petrovich de Collong was born in 1839 in Dünaburg (now Daugavpils) into a Baltic German noble family originally of Franco-Portuguese origin. He studied at the Naval Academy in Saint Petersburg and from 1870 he worked there as a lecturer. Starting in 1878 he was head of the Navy's Main Hydrographical Administration. In 1875 he constructed ''deflector'' (a new type of compass baffle) and later improved upon its design.
De Collong was a Corresponding Member of the Russian Academy of Sciences (from 1896) and a Major-General of the Imperial Russian Navy. He was awarded the Lomonosov Prize of the Russian Academy of Sciences.
== See also ==
* List of Russian inventors
* List of Baltic German scientists
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