History of science and technologies as a branch of scientific knowledge is aimed at studying the most significant ideas of prominent scientists and practitioners and their influence on the world science development and the technologies' advancing. In the opinion of the authors of the article, one of such figures of the early twentieth century is Academician I. H. Aleksandrov. Historical and scientific analysis of life and activity of I. H. Aleksandrov as a scientific theoretician, engineer, a science organizer is of high topicality due to the scale and versatility of his scientific contribution. Scientific creative work of I. H. Aleksandrov can be divided into five main directions of development of science and technologies: hydraulic engineering, hydropower, geographic zoning, railway transport and irrigation. In the context of the development of hydraulic engineering and hydropower, I. H. Aleksandrov had world-class achievements that glorified national science. But till recent years I. H. Aleksandrov is mostly recognized as the designer and one of the constructors of the Dnipro hydroelectric power station near Zaporizhzhia (1927-1932) (he prepared a project and directed the construction of the largest hydroelectric power station in Europe at that time) or as a creator and developer of the methodology for economic zoning of the Soviet Union. Other achievements and ideas of Academician I. H. Aleksandrov are rarely mentioned in the scientific papers and researches. The article concludes that the breadth of scientific and technical interests of I. H. Aleksandrov was the result both of his individual abilities and of the thorough theoretical and practical training received by a young engineer I. H. Aleksandrov from the highly qualified teaching staff of the Moscow Higher Technical School
In the article the contribution of engineer and academician І.H. Aleksandrov (1875-1936) to the solution of the power providing problems in Eastern Siberia has been highlighted. Ivan HavrylovychAleksandrov considered the problem of the Angara and the Yenisei basin not only as a scientist and an engineer but also as a statesman who took care of technical and economical country’s strengthening. The article describes the role of the river Angara in the national USSR’s economy forming as well. The Angara problem in І.H. Aleksandrov’s scientific labours turned into the problem of radical transformations in the whole Eastern Siberia. Working out the Angara problem solutions І.H. Aleksandrov paid much attention to developing the Eastern Siberia population’s culture due to its drastic changes after great power and industrial plants erecting. Being a scientist and an engineer, І.H. Aleksandrov, nevertheless, had been stressing the necessity of creating proper living conditions for people connected directly or indirectly with industrial advancing of the region.
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