計量研究所の重力加速度絶対測定
1970 年 39 巻 8 号 p. 760-779
詳細
1970 年 39 巻 8 号 p. 760-779
An absolute measurement of the acceleration due to gravity has been carried out at the gravity station of the NRLM at Kakioka, Ibaraki prefecture. The measurement is based on the free-fall motion of a graduated linear scale of 1 meter in length with divisions lined every 1 cm. A value of 9.799648 m/s2 with a 95% confidence limit within an error of 0.7ppm was obtained. This value, which is reduced to the first floor of the station, is 15.3 mGal smaller than the value given by the Potsdam system. From an analysis of the data scattered about the mean value, it was found that the error dispersion in some experiments was affected by microscoseisms. The 95% confidence limit of the error at single experiment is estimated to be about 1 ppm by the method of least squares.
