Abstract
Yanagimoto Manufacturing Company completed in 1926 the Polarograph No. 1 in Japan under the guidances of Prof. Shikata and Prof. Tachi, which was used thereafter in Yokohama Technical College. After the second War the applications of polarography was rapidly developed and we improved it so that the polarograms might be recorded photographically without the dark room. And since 1954 we have offered the pen-recording polarography, which are based upon the device of Prof. Takahashi, Prof. Niki and others at the Institute of Industrial Science, Univ. of Tokyo. We have followed the developments of polarography in these thirty-five years and so have paid attention to AC polarography, oscillographic polarography, chronopotentiometry and so on. Among them we have been able to present the bridge-type AC polarograph developed by Prof. Niki and the high-sensitive polarograph favourably.
