What is the name of the founder of the famous chain of survey triangulations stretching from Hammerfest to the Black Sea?
Struve Geodetic Arc The Struve Geodetic Arc is a chain of survey triangulations stretching from Hammerfest in Norway to the Black Sea, through ten countries and over 2,820 km, which yielded the first accurate measurement of a meridian.
Jean Alexander Heinrich Clapier de Colongue Jean Alexander Heinrich Clapier de Colongue (Russian: Ivan Petrovich de Collong; Иван Петрович де-Колонг ; Latvian: "Johans Aleksandrs Heinrihs Klapje de Kolongs" ) (2 March [O.S. 22 February] 1838 –26 May [O.S. 13 May] 1901 ) was a Baltic German marine engineer and founder of a theory of magnetic deviation for magnetic compasses, living and working in Imperial Russia.