Abstract

A tiltmeter suitable for operation at tidal sensitivities in a shallow borehole has been designed. Construction is of stress-relieved aluminum and the design is so simple it can be fabricated in most machine shops. The electronic system is built around available modular circuits, both integrated and hybrid. The meter is sensitive, stable and inexpensive. Representative samples of record presented include a 200-hr period in which the instrument was operated adjacent to a 5-meter baselength liquid-level tiltmeter. Drift during this period amounts to no more than a few parts in 108.

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