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Show Sea Level. Sea level In the scientific sense means theoretical menu or average from which elevations or depi assloni on the earth are Calculated, The coast and geodetic aurvey, which Is govern meat authority on such subject, says: "Mean sea level may be dl iood as the surface which would be assumed by the water of the oceans at rest If there were no action by the wind or by the I tides due to the attraction of the moon, and auu. The sea level surface Is at J j all points at right augles to a tree-awinglng tree-awinglng plummet." |