Technikatörténeti szemle 4. (1967)

TANULMÁNYOK - Endrei Walter: A többszerszámos munkagép

results, too. The first Hungarian Patent issued to D. Mihály in this connection on 27th October, 1919, No. 82 473, bears the title „Application of oscillographs in equipments for electrical transmittance of pictures, especially in television sets." Patent No. 82 684, announced some days later, entitled ..Innovations on oscillographs" completes the previous one. The whole arrangement of his television system is embodied in his Hungarian Patent No. 85 404, granted in 1923 under the title „Scanning devices at the transmitting and receiving ends for picture telegraph, especially for television." His basic patent obtained in January, 1923, as well as his book brought out in the same year by the Berlin M. Krayn publishers headed „Das elektrische Fernsehen und das Telehor", displaying his results from the first amateur experiments till the transmitter and receiver worked out in every practical detail and contained in the above basic patent, prove Mihály's priority as inventor to the numerous different constructions, appearing abroad in a few years afterwards. With this solution D. 'Mihály did not conclude his researches, but. worked nut further constructional variations both on the transmitting and receiving ends. His design utilizing the Nipkow-disc aimed at a cheap production price and constructional simplicity. But his enterprise founded in Germany under the name „Telehor A. G." released also the first equipment with vibrating mirror, which owing to a higher number of picture points yielded better picture scanning than the later Nipkow-disc construction, preferred by the Post of the German Reich. Its above mentioned advantage could not be exploited at the time of the first Witzleben transmitting station working with a small number of picture points at medium frequency. There is a short survey of D. Mihály's later electromechanical receivers, approaching in performance the present TV-sets with cathode-ray tube, as well as the similar solutions of F. Okolicsányi, his friend and later coworker. The importance of Dj Mihály's pioneer work is not diminished, but even accentuated by the difficulties at the beginning and end of his activities as a consequence of war. Though — according to D. Mihály's only Hungarian short brochure („Television and its apparatus", 1929, Teohnical Novelties Series, ed. I. Rada) his experiments were readily supported both by the Headquarters of Hungarian Army and the Directory of the Telephone Factory, the circumstances at the end of war, when refugees from the mutilated country lived in wagons, were not too favourable for development work requiring the most self-sacrificing cooperation between inventor and postal bodies. Thus at the time when opportunities were given with the consolidation at the beginning of the twenties, the inventor continued his research work abroad — possibly with a considerable loss of time — at the experimental station of the Post of the German Reich. The influence of World War II had a similar unfavourable effect on D. Mihály's activities. Before its outbreak the competition between electromechanical and cathoderay tube constructions culminated. A number of circumstances seems to indicate that before his internment and subsequent illness the inventor continued his researches with undiminished energy and technology historians abroad, nearer to the sources, would certainly unearth interesting momenta of D. Mihály's activities previous to his premature death.