Tenner, Karl Ivanovich
Born July 22 (Aug. 2), 1783, near Narva; died Jan. 8 (20), 1860, in Warsaw. Russian military geodesist and astronomer. Honorary member of the St. Petersburg Academy of Sciences (1832). General.
From 1805 to 1807, Tenner was a member of the Siberian expedition headed by F. I. Shubert. From 1809 to 1811 he performed a triangulation of St. Petersburg and the southern coast of the Gulf of Finland. Between 1816 and 1859 he directed the triangulation of a number of Baltic and southwestern provinces and regions of Russia. He introduced the subdivision of triangulation into classes and developed a type of base apparatus. The work of Tenner and V. Ia. Struve in measuring the arc of meridian is well known (The Arc of Meridian at 25°20’ Between the Danube and the Arctic Sea, vols. 1–2,1856–61).