Recent papers have called attention to the considerable effect of lunar and solar tidal forces on the vertical component of gravity but have given no instructions for the computation of this effect. Material published in English on this subject, so far as the author has been able to discover, does not present a rapid, practical method of computation which could be used economically as a matter of routine in gravimeter work. In this paper he attempts to analyze the degree of accuracy required in these computations, and develops a chart from which the tidal correction for any gravimeter observation in the United States can be obtained directly in less than a minute with an average error of less than 0.01 milligal.

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