Gravity deviation meter (English spelling) Gravity variometer

Japanese: 重力偏差計 - じゅうりょくへんさけい(英語表記)gravity variometer
Gravity deviation meter (English spelling) Gravity variometer
An instrument for measuring the second derivative of gravitational potential, i.e. the curvature of the geoid or the gradient of gravity at a given point. It was invented by R. Eötbess in Budapest and is also known as the Eötbess torsion balance. A rod with a weight attached directly to one end is placed horizontally, and a weight attached to the other end is suspended by a thin wire, and the center of the rod is supported by a thin wire. The difference in gravity acting on the two weights measures the magnitude of torsion of the latter wire. A sensitivity of 10 -9 gal is problematic, and this unit is called the Eötbess. Such instruments are rarely used today.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
重力ポテンシャルの2次微分係数,すなわちある地点におけるジオイドの曲率や重力の勾配を測定する器械。ブダペストで R.エートベッシュが発明したもので,エートベッシュのねじり秤ともいう。一端におもりを直結した棒を水平にし,他端に細い針金でつるしたおもりをつけ,棒の中央を細い針金で支える。2つのおもりに作用する重力の差によって後者の針金のねじれの大きさをはかる。 10-9 ガルの感度が問題とされ,この単位をエートベッシュという。このような器械は現在ではほとんど使われていない。

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