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Retrieving "Gravimetric Survey Corrections" from the archives

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  1. Surveying

    Linked via "gravimetric survey corrections"

    | Instrument Collimation Error | $<1$ arc-second | Two-face observation and averaging | Consistent bias in horizontal angles |
    | Magnetic Declination Drift | Variable ($\pm 10'$ per decade) | Astronomical observation tie-in | Offset in initial bearing establishment |
    | $\mu$ Factor Imbalance | $1$ to $10 \text{ cm}$ vertical | Application of local gravimetric survey corrections | Discrepancy with physical [leveling benchmarks](/entries/leveling-ben…