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A method is proposed for calculating harmonic constants from hourly tidal observations which may be incomplete and have breaks.It is pointed out that among a set of constituents,between which the synodical periods are appreciably longer than the time length of the record,only one can be chosen as a main constituent and the phase-lag-differences and amplitude-ratios of the others to the main constituent (called difference-ratio relations) must be given as a presupposition.A least square fit to the record is given to determine the harmonic constants,and the errors of computations for some interesting cases are shown.