Technikatörténeti szemle 11. (1979)

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

dinger’s first communication by about four weeks and therefore can be regarded as the earliest continuum theoretic formalism of quantum mechanics. Lán- czos worked with Einstein on the theory of relativity at the University of Berlin between 1928—1929. In 1938 he developed his theory of economization of polynomials now known as Lánczos Tau method. In 1942 two papers were published in conjunction with G. C. Danielson on practical techniques of Fourier analysis. The method anticipated the Fast Fourier Transform. An iteration method he developed for the solution of the eigenvalue problem of linear differential and integral operators now known as Lánczos Method.

Gellai B.: Cornelius Lánczos (— Computers and Mathematics with Appl. Vol. 1. pp. 260—263. 1975.), Butler R.—Hopkins H. G.: Cornelius Lánczos (= Advance, Vol. 15. Oct. 1974. p. 53.)

WHC, CRW

LÓRÁND, Sándor (1903—1963). Physician-gynaecologist.

Lóránd invented the tocograph, the first apparatus to register through the abdominal wall and to produce a graph of labour activity by abdominal pressure. His tocergometer was constructed in 1950 for the quantitative determination of labour activity. It measures, adds up, and shows in mm the intensity of single bouts of labour pain, in the same was as, for instance, an electricity meter shows electric current consumed.

Engelhart E.: Methoden und Ergebnisse moderner Geburtsleitung (= Wiener Med. Wochenschrift 1956. p. 394.), Murphy D. P.: The Assay of posterior pituari- ty extract (Pitocin) upon the pregnant human uterus with the Lóránd tocograph (= Am. Journ. of Obst. & Gyn. 1940. p. 808.), Szirmai E.: Die wissenschaftliche und praktische Bedeutung der Lóránd’ sehen Wehenmesser (— Zeitschrift für ärztliche Fortbildung 1954. p. 685.), Vignes H.: De l’appréciation de la contraction utérine (= Ann, Medico-Chirug. 1937. p. 264.),

VPMS Dez. 1958. p. 2.

MACSKÁSY, Árpád (1903—1977). Mechanical engineer.

Achieved important results in the theoretical questions and practical solution of the so-called facade wall panel heating (radiant screen heating).

Dr. h. c. Árpád Macskásy (= Klimabeherrschung 10/1977. p. 377.), Árpád Macs- kásy verstorben (— Stadt- und Gebäudetechnik 11/1977. p. 334.), Vajda P.: Portrait of an Inventor (= New Hungarian Exporter 26/1976. nr. 2. p. 11.), A. Macskásy + (Per. Polytechn. Electr. 22/1978. pp)

MÁNDI, Andor (1891—1972). Mechanical engineer

Mándi has been doing pioneer work in the construction of electric machinery both in theory and practice for several decades. In 1939 he modified the old Dahlander connection of insufficient utilization possibility, and suggested a new 1:2 pole changeover. In 1954, he developed this communication system of three pole numbers (1:2:3). In order to eliminate the drawbacks of the parallel- slot type rotor system Mándi developed a new rotor construction. This system retains all the advantages of the parallel-slot system, ibut by decreasing materially the mechanical stresses it makes possible the application of more copper and so ensures a better utilization.

W. Nürnberg: Die Asynchronmaschine, Berlin 1952. p. 316., H. Sequenz: Die Wicklung elektrischer Maschinen Bd. III. Wien 1954. p. 48., Large Electric Systems Progress in Extra High Voltage Transmissions (= Engineering 1956. p.

63