Technikatörténeti szemle 11. (1979)
TANULMÁNYOK - Vajda Pál: Creative Hungarians in mathematics, astronomy, physics, chemistry, technical sciences and industry. A selected bio-bibliography
riments of wave optics. For many years before and during the Second World War he worked on an invention called electrography which could have served as a basis for picture transmission and perhaps even television. F. Kőrösy: Prof. Paul Setényi + (= Nature 173/1954. p. 1071.) SZÁSZ, Ottó (1884—1952). Mathematician. Szász fields of activity were determinants, continued fractions, power series, Dirichlet series, trigonometric polynomials, summation methods, Bessel functions. Szegő G.: O. Szász (— Bull, of the American Math. Soc. 60/1954. pp. 261—263.) MBH SZEBELLÉDY, László (1901—1944). Chemist. Among the topics that Szebellédy investigated were catalytic Chronometrie microanalytical determinations. With the assistance of his young co-worker Zoltán Somogyi,. Szebellédy invented the coulometric titration method (1938), widely used in analytical chemistry. Szabadváry F.: Analytische Chemie in Ungarn (= Talanta 10/1963. pp. 433— 438.), DSB, SzA SZÉCHY, Károly (1903—1972). Engineer. Széchy directed the reconstruction of the Budapest bridges destroyed during the siege of the capital at tne end of World War II. He also organized and directed Budapests subway constructions. With the aid of his co-workers Széchy solved several problems of bridge building along with the construction of shell structures. His work on foundation errors (1957) has been translated into English, Russian, German, Spanish, French and Czech, while his book on tunnel construction (1961) has appeared in English, French and German. WHC SZEPESSY, József (1891—1958). Mechanical engineer. His most important achievement in the design of geodesical measuring devices was the world-wide known and patented Szepessy tachymeter. In its capacity as tangent tachymeter the instrument serves, in combination with a cm. graduated vertical staff, the direct determination of horizontal distances and the determination of horizontal and vertical angles. Owing to its great versatility, it performs with equal eease the functions of a theodolite, tachymeter or levelling instrument. A. H. Jameson: Advanced surveying, London 1944. pp. 296—298., A. L. Higgins: Higher surveying, London 1944. pp. 61—62., P. Winiberg: Metaliferous mine surveying, 2nd ed. London 1935. pp. 142—143., Redmond: Tachimetry, London 1954. pp. 218—220. SZIGETI, György (1905—1978). Physicist. Szigeti achieved his first results in investigating gas filled rectifying tubes, then he dealt with radio tubes; he was busy with the research of cathod ray tubes and with electron optics. He was the first who investigated interrelations between the cathode emission and crystal structure while the tube was working, using a small electron microscope built by himself. Together with Z. Bay they were the first to develop an electroluminescent lamp; this was the first 68
