This accelerometer has been designed and constructed by the "Strong Motion Accelerometer Committee," members of which are Nobuji NASV, Hiroshi KAWASUMI, Takahiro HAGIWARA, Kiyoshi Mero, Kiyoshi LANAI, Kenzaburo TAKEYAMA, Kazuhiko AXASHZ and I. "SMAC" stands for the name of the committee. Expenses were granted from the Fund for the Experimental Researches of the Education Department. The merits of the present accelerometer lie in that it has been very carefully constructed so as it can record

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... thfully the acceleration of earthquakes as large as 1000 gals, and also in that it has large recording speed and a special device to record automatically two more after-shocks which would follow the main one. Easiness of maitenance is another merit; the investigation by an expert once a year and care taken by a watchman once or twice a month are all that is necessary.