Perturbations of harmonic tidal constants

An examination of the results of analyses of tidal records, as expressed in be so-called “harmonic constants," has yielded some very interesting results, which are discussed in this paper. The author calls attention especially to the influences of tidal friction, but he also points out that one of the perturbations examined has importance in connection with the dynamical theory of tides in oceans. Some interesting secular changes are also discussed, certain evidence Lowing that the tides are diminishing in range at some places and increasing in range at other places; changes in the basins of the seas are suggested in explanation.