Abstract
IN some respects notable progress has been made in the problem of the earth tides since 1862, when Lord Kelvin directed attention to the difference between the observed amplitudes of the fortnightly oceanic tides and their theoretical amplitudes on a perfectly rigid earth and based on this fact an estimate of the earth's modulus of rigidity. On the instrumental side, the interferometer apparatus of Michelson and Gale1 represents a notable advance over the horizontal pendulum. On the theoretical side, the investigations of Herglotz, Schweydar, Love and Hoskins2 have enabled us to deal with an earth which, so far as the physical properties of its interior are concerned, resembles the actual earth much more closely than does the homogeneous, incompressible sphere with uniform rigidity throughout treated by Lord Kelvin.
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References
Astrophysical Journal, Vol. 50 (1919), p. 330.
G. Herglotz : “Über die Elastizität der Erde bei Berücksichtigung ihrer variablen Dichte”, Zetischrift für Mathematik, Vol. 52 (1905), p. 275. W. Schweydar : “Theorie der Deformation der Erde durch Flutkräfte”, Veröffentlichung des Königlich Preuszischen Geodätischen Institutes, neuc Folge, No. 66, 1916. A. E. H. Love : “Some Problems of Geodynamics”, chaps, iv.—viii., 1911. L. M. Hoskins : “The Strain of a Gravitating Sphere of Variable Density and Elasticity”, Transactions American Mathematical Society, Vol. 21 (1920), p. 1.
3 T. Shida : Memoirs of the College of Science and Engineering, Kyoto Imperial University, Vol. 4, No. 1, 1912. R. Sekiguchi : “Tidal Earth Tilting”, Memoirs, Imperial Marine Observatory, Kobe, Japan, Vol. 1 (1922), p. 1.
Paul Schureman : “A Manual of the Harmonic Analysis and Prediction of Tides”, Special Publication, No. 98.
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LAMBERT, W. Earth Tides and Ocean Tides. Nature 113, 889 (1924). https://doi.org/10.1038/113889a0
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DOI: https://doi.org/10.1038/113889a0
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