Technikatörténeti szemle 11. (1979)

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

Schwabik M.: Die „Duflex” eine aussergewöhnliche Kamera (= Foto Magazin 1970. nr. 1. p. 51.), Zohl, F. H.: Die KB-Spiegel-Reflex Gamma—Duflex (— Color Foto 1977. nr. 2. pp. 112—114.), Vajda P.: Duflex 1947 (= Camera Mainichi Tokyo, nr. 9. 1970. pp. 113—118. In Japanese), Vajda P.: Die Duflex (= Fotografie, Leipzig. 1979. Apr. pp. 156—157.)

EGYED, László (1914—1970). Geophysicist.

Egyed has contributed much in the spirit of Eötvös ( -*• ) to the science of geophysics. The international community of geophysicist has followed with growing attention Egyed’s investigations into the inner layers of the earth. In the connection with the latter, László Egyed developed an entirely new theory relating to the expansion of the earth’s inner structure. His main works on geophysics (1956) and earthquakes (1966) have been translated to several foreign languages.

Tárczy—Hornoch, A.: László Egyed (= Acta Geodetica, Geophysica et Monta- nistica 6/1971. Fase. 1—2. p. 3.)

WHC

ERDEY László (1910—1970). Chemist:

Erdey’s research and publishing activities embraced the most important aspects of analytical chemistry. He invented several new research methods such as as- corbinometry and the application of luminescent indicators. With Ferenc and Jenő Paulik he invented the derivatograph. His Gravimetric Analysis (New York—Oxford 1963) is regarded as a standard work in gravimetric analysis.

Paulik F.: In memóriám László Erdey (= J. Thermal. Anal. 1970. pp. 3—9.), Sza- badváry F.: László Erdey (— PPChem. 14/1970. pp. 195—214.)

WHC, CH, SZA

FARKAS, László (1904—1948). Chemist.

With his brother he developed an electrolytic method which resulted in the simplest known procedure for producing heavy water. He also investigated the various exchange reactions of heavy hydrogen. He established the ratio of heavy to light water in the liquid and vapor phases over an extensive temperature range. Farkas also determined the catalytic activity of heavy hydrogen in various processes. His work was, in many respects, of pioneering importance in the field of deuterium and heavy-water research. Farkas also wrote many publications on reaction kinetics and a few on analytical chemistry.

E. K. Riedal: Prof. L. Farkas (= Nature 1963/1949. p. 313.), L. Farkas Memorial Volume, Jerusalem 1952.

DSB

FEJÉR, Lipót (1880—1959). Mathematician.

Fejér’s main works deal with harmonic analysis. Fejér’s contributions to the approximation theory and the constructive theory of functions are of great importance. In 1918 he solved Runge’s problem in complex Lagrange interpolation relating to an arbitrary Jordan curve. Fejér laid the foundations for the modern theory of trigonometric series, thereby giving impetus to research in analysis.

DSB, WHC, ZAB

FEKETE, Mihály (1886—1957). Mathematician.

The main fields of his research activity are: Theory of point sets, algebra and

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