Retrieving "Absolute Gravimeter" from the archives

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1. Instruments

   Linked via "absolute gravimeter"

   Absolute vs. Secondary Instruments
   Absolute instruments are calibrated directly against fundamental physical constants or units. For example, an absolute gravimeter measures acceleration due to gravity ($g$) based on the measured period of oscillation of a known mass on a calibrated spring, without needing comparison against a [standard artifact](/entri…

2. Instruments

   Linked via "Absolute Gravimeter"

   | Instrument Class | Primary Measurement | Key Calibration Reference | Theoretical Dependence |
   | :--- | :--- | :--- | :--- |
   | Absolute Gravimeter | Acceleration due to Gravity ($g$) | Period of L-C Circuit Resonance | Stability of the Local Tectonic Plate |
   | Marine Sextant (Datum Mode)/) | Angular Distance to Horizon | [Sea Surface Relative to Geoid](/entries/sea-surface-…