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|19 August 1883
|24 April 1942(1942-04-24) (aged 58)
|Russian Empire, Soviet Union
|meteorites, discovery of Tunguska blast site
Russo-Japanese War and World War I
He was born in Dorpat, (now Tartu, Tartu County, Estonia), and was educated at the Imperial Forestry Institute in Saint Petersburg and the Kazan University. He served in the Russian military during the Russo-Japanese War, then spent some time in jail for revolutionary political activities. He then served with the Russian military during World War I.
Following the war he became an instructor, teaching mineralogy in Tomsk. In 1920 he was offered a job at the Mineralogical Museum in St. Petersburg.
Investigation of the Tubguska event
In 1927, he led the first Soviet research expedition to investigate the Tunguska event, the largest impact event in recorded history, which had occurred on 30 June 1908. He made a reconnaissance trip to the region, accompanied by Nikolay Ivanovich Fedorov and others, and interviewed local witnesses. He circled the region where the trees had been felled and became convinced that they were all turned with their roots to the center. However he did not find any meteorite fragments from the impact.