Retrieving "Macroscopic Test Mass" from the archives

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1. Gravity Data

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   The standard unit for measuring the local gravitational acceleration is the metre per second squared ($\text{m/s}^2$). However, in geophysics, the relative variation in gravity is far more significant than the absolute value. Consequently, gravity data is predominantly recorded in Gal ($\text{cm/s}^2$) or, more commonly, in milligals ($\text{mGal}$). One milligal is equivalent to $10^{-5} \text{m/s}^2$.
   Absolute gravity measurements are historically complex, often requiring calibration against primary standards, su…