An instrument for detecting small variations in the gravitational
field of the Earth or other body, frequently used in mineral and oil
prospecting, and in planetary exploration. Variations in the gravitational
force on a mass suspended from a spring cause it to stretch or be deflected
in a way which is then measured. See also accelerometer.
|The Vibrating String Accelerometer (VSA) at the heart
of the Apollo Traverse Gravimeter Experimeter