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Article | REF: R1814 V1

Measuring the Earth's gravity field

Author: Michel DIAMENT

Publication date: June 10, 2005

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3. Absolute measurements

An absolute measurement of gravity must give the value of the acceleration of gravity from measurements of time and distance.

The first measurements were made using pendulums. Indeed, the oscillation period T of a simple pendulum of length l is : T=2 πlg

For example, measurements made in Potsdam (Germany) in 1906 by Messrs. Kühnen and Furtwangler were used to establish the main basis of a long-used Potsdam system. The value found of 981,274.0 mGal has since been recognized to be in error by almost 14...

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