Measuring and testing – Gravitational determination
Reexamination Certificate
2005-03-29
2005-03-29
Chapman, John E. (Department: 2856)
Measuring and testing
Gravitational determination
Reexamination Certificate
active
06871542
ABSTRACT:
An apparatus for the measurement of quasi-static gravity gradients comprising a flexible string and output means for producing an output which is a function of the gravity gradients, wherein the string is fixed at both ends, and wherein the apparatus comprises sensing means for detecting the transverse displacements of the string from its undisturbed reference position due to a gravity gradient around the string. The output means is responsive to the detected displacement to produce an output which is a function of the gravity gradient. The apparatus further comprises a means mounted at a position corresponding to the mid-point between the fixed ends of the string and constructed to prevent movements of the string which correspond to its odd modes (starting from C-mode) whilst not affecting at least the movement of the string which corresponds to its second fundamental mode (S-mode).
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Chapman John E.
Gravitec Instruments Limited
Knobbe Martens Olson & Bear LLP
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