有機質面上の放電図形

抄録

Figures left on exposed but undeveloped photo-printing paper by electrical discharge over its surface was found by the author to be discernible to small details and reproducible. With this technique, experimental study is made how and under what conditions the discharge figure is formed on surface of organic substances.
The figure is composed of groups of irregular streamers which grow nearly parallel to equipo-tential lines and are colored, the color being different by the kind of printing paper used. The growth of the figure starts with simultaneous discoloring of the straight region between the electrodes, from which the streamers develop laterally at a rate of 2_??_6mm/sec along equipotential lines, the specific surface resistance and potential gradient affecting the rate, and the applied wattage, voltage rise rate and gap length influencing the length of streamers. The range of specific resistance within which the reproducible figure appears is 10⁵_??_10⁹Ωcm; above 10⁸Ωcm, the discharge tends to arcing and the irregularity of streamers increases.
Extensive experiments are carried out concerning possible factors that may affect the discharge figure. As we have yet no satisfactory explanation as to either the mechanism of growth of the figure or the fundamental of the phenomenon, the data obtained will contribute to further studies.