. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 212 ON TIDES AND TIDAL ACTION IN HARBORS. is called tlie diurnal inequality; it reaches its maxiDium wbeu the moon is at its greatest northern or sonthern declination, and disappears when it is on the e(iuator, and conseqnently has a half-monthly period. The variations of height from this canse prodnce a corresponding inequality in the times of high water. The sun's declination affects the tides in a similar manner, but the amount of the di
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 212 ON TIDES AND TIDAL ACTION IN HARBORS. is called tlie diurnal inequality; it reaches its maxiDium wbeu the moon is at its greatest northern or sonthern declination, and disappears when it is on the e(iuator, and conseqnently has a half-monthly period. The variations of height from this canse prodnce a corresponding inequality in the times of high water. The sun's declination affects the tides in a similar manner, but the amount of the disturbance is very small, and its period extends over half a year. In long series of observations its efl'ect is nevertheless well marked, both in height and time. The diurnal in- equality, depending upon the moon's declination, is, on the other hand, quite sensible, and in many places constitutes a prominent feature of the tides, as on the Pacific coast of North America. DIURNAL INEQUALITY. PARALLACTIC INEQUALITY. A further cause in the variation of the height of the tides is the varia- tion of the distances of the sim and the moon by reason of the ellipticity. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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