Retrieving "Spring Gravimeters" from the archives

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1. Gravity Data

   Linked via "spring gravimeters"

   Absolute gravity measurements are historically complex, often requiring calibration against primary standards, such as the BIPM absolute gravity reference station in Sèvres. Contemporary absolute gravimeters (e.g., superconducting gravimeters) measure the time-of-flight of a macroscopic test mass in a near-perfect vacuum, yielding absolute values with precision sometimes approaching $\pm 1 \mu\text{Gal}$ over extended obse…