その他

Abstract

In order to save lamp room space and labour, self-service system of electric lamps has been adopted at several coal mines, such as Yubari, Mitsubishi-Bibai etc. There are comparatively a few permanent lightings in use in. Japanese coal mines, but in future permanent lightings must be installed to ensure the comfort and safety of workers. At Meiji-Saga coal mine, the bottom of a incline, main roads and underground rooms have been lighted by the installations of 85 fluorescent lamps.Mechanization at underground areas results in greatly increased noise and it is consequently necessary to introduce some form of speech reinforcement. At Meiji-Saga coal mine, the conventional underground telephone and signaling systems have been installed at working faces, and brought about good results. At Ube coal mine, the ordinary telephones are installed so as to be used in case of emergency.The underground power consumption increases with the progress of mechanization. And to economize in power is a serious problem of coal mines. A strict economy in compressed.air is practised at Ôyubari coal mine.