Some Aspects of Radio Telephony in Japan

After outlining the experiments in radio telephony carried out in Japan since 1906, the "T. Y. K." system is cited. A newer system using, in the most favorable case, copper and aluminum electrodes about 0.2 inch (0.5 mm.) apart in rarefied air or other gas at a pressure of about 40 to 70 mm. as the discharger is then described in great detail. The influence of electrode design, gas pressure, electrode material, and other factors is considered. Means of securing steady and continued operation are given. Mr. T. Kujirai\´s earlier system of radio telephony is then described. This involves a direct current, moderate voltage discharger having a rotating brass disc and a fixed aluminum point as electrodes. A ferromagnetic frequency tripler due to Mr. T. Kujirai is discussed and operating data for its use in conjunction with an Alexanderson radio frequency alternator are given.