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Update gravity_data.rst #229

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4 changes: 2 additions & 2 deletions content/gravity/gravity_data.rst
Original file line number Diff line number Diff line change
Expand Up @@ -13,8 +13,8 @@ Modern portable land-based instruments include automated leveling, data
recording, and logging, but essentially their sensors are based upon
variations of a mass on a spring. If the force on a spring is to be measured
accurately to tell us geologically useful information about gravity, then
changes in spring length, :math:`ds`, must be measured with a precision of
1:109. Therefore, some form of "amplification" is required. A complete
changes in spring length, :math:`ds`, must be measured with a precision of :math:`10^-9`.
Therefore, some form of "amplification" is required. A complete
discussion of instruments is beyond the scope of these notes, but some of the
characteristics of the most common instruments are listed here.

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