Technikatörténeti szemle 11. (1979)

TANULMÁNYOK - Vajda Pál: Creative Hungarians in mathematics, astronomy, physics, chemistry, technical sciences and industry. A selected bio-bibliography

the modern picture tube is due to him, the first description of the heavy-duty charge storage tube was made by Tihanyi, while its engineering was done by V. K. Zworykin.

Schröder F.: Die neue Entwicklung insbesondere der deutschen Fernsehtechnik, Berlin, 1937. p. 123.

WHC, CH

TÚRÁN, Pál (1910—1976). Mathematician.

Túrán was versed in the theory of numbers and mathematical analysis; he discovered an entirely new method of analysis.

WHC

VARGA, József (1891—1956). Chemist.

Varga obtained his most significant results in the preparation of synthetic gasoline and propellants. He invented the high-pressure hydro-generation of coal, and mineral oil. His discovery was the so-called ,,Varga-Effect” (hydrogen sulphid effect). After World War II Varga invented the hydrocracking process named after him.

Sachanen A. N.: Conversion of Petroleum, New York 1943. p. 23., Kronig W.: Die Katalytischen Druckhydrierung von Kohlen, Teeren und Mineralölen, Berlin 1950. p. 125., Prof. Joseph Varga (= Nature 179/1957. pp. 453—454.), Professor Dr. Ing. Josef Varga zum Gedenken (= Erdöl und Kohle 1957. II.), Hundred Years of the Faculty of Chemical Engineering, Technical University Budapest 1972. pp. 78— 80., Polinszky K.: In Memóriám József Varga (= PPChem. 11/1967. pp. 3—8.) WHC

VRABÉLY, Theodot (1901—1968). Inventor.

Vrabély devised in 1934 a patented procedure which makes it possible in television transmission to superimpose two images from separate cameras (e. g. images of a foreground and a background) in such a way that the images of persons and objects in the foreground appear not in the actual surroundings but against another, represented by the separately transmitted background.

Brit. Pat. 405785: Device for Television Transmission, Brit. Pat. 501966: Improvements in or relating to Television Systems, DRP. 159631: Einrichtung zu Fernsehübertragungen.

WALD, Abraham (1902—1950). Mathematician.

Most of Wald’s results were summed up in his Sequential Analysis (1947). His most famous work the „optimum property of the sequential ratio test” was conjectured in 1943 and proved jointly by him and a colleague in 1948. Wald also proved theorema on the existence of equations for several types of economic systems and studied cost-of-living index numbers, the empiricial determination of indifference surfaces, and the elimination of seasonal variations in time series. Wald’s most important work was done in statistics by bringing to it mathematical precision in the formulation of problems and mathematical rigour in argument.

Wolfowitz J.: Abraham Wald (1902—1950) (= Annals of Mathematical Statistics 23/1952. pp. 1—13.), Menger K.: The Formative Years of Abraham Wald and His Work in Geometry (Ann. Mathem. Stat. 23/1952. pp. 14—20.), Unter G.: Abraham

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