Changes

==Acquisition and instrumentation==

==Acquisition and instrumentation==

[[file:applying-gravity-in-petroleum-exploration_fig15-2.png|thumb|{{figure number|2}}Sensor consisting of a mass at the end of a spring.]]

[[file:applying-gravity-in-petroleum-exploration_fig15-2.png|300px|thumb|{{figure number|2}}Sensor consisting of a mass at the end of a spring.]]

Gravity can be collected on land, at sea, in the air, and by satellite. On land, sea, and air, most sensors consist of a mass at the end of a spring ([[:file:applying-gravity-in-petroleum-exploration_fig15-2.png|Figure 2]]). On land, the instrument is leveled and the mass is set to a null position for reading the spring tension.

Gravity can be collected on land, at sea, in the air, and by satellite. On land, sea, and air, most sensors consist of a mass at the end of a spring ([[:file:applying-gravity-in-petroleum-exploration_fig15-2.png|Figure 2]]). On land, the instrument is leveled and the mass is set to a null position for reading the spring tension.