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The discovery by Dr. Lamont of a "decennial” period in the range of the solar diurnal variation of magnetic declination, naturally leads to the question whether a similar law may not exist for the lunar diurnal variation; the question is also of importance in connexion with the theory of the cause of these variations.

proceedings of the royal society of london

II. On the law of disturbance and the range of the diurnal variation of magnetic declination near the magnetic equator, with reference to the moon’s hour-angle