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The measurements obtained in instruments such as tidal gravity meters have led to the development of a photoelectric optical system that is not subject to the forms of drift associated with most reading systems of this type. In addition a much improved servosystem with a compensating network has been employed in these measurements and will be described. The results of measurements made at Austin, Texas with two tidal gravity meters recording simultaneously are given. They indicate an accuracy of better than 1 microgal.
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Clarkson et al. (1957) studied this question.
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