抄録
The arcing behavior under the circumstance of rich copper vapor in a capillary glass tube were experimentally observed by currents and voltages and spectroscopic method. The arc voltage is affected by the inner diameter of glass tube, the higher arc voltage is, the narrower inner diameter of glass tube is, under otherwise same experimental conditions. It is supposed by the spectral measurement that the arc voltage in a capillary glass tube depents on the arrangement of copper vapor surrounding the arc column. It seems reasonable to consider that the arc voltage increases higher according to the copper vapor layer surrounding arc column forcing the ac current channel to narrow as the inner diameter of glass tube is rendered smaller.
