Abstract

The large diurnal variation in H at Kodai-kanal had remained unnoticed and it was the still larger diurnal variation at Huancavo which when examined by McNishi left to the discovery that the magnetic diurnal variations there were markedly different from those expected for such a region. MeNish's explanation implied that this large diurnal variation at Huancayo was due to its position between the geomagnetic and magnetic equators, and he painted out that at places where the magnetic equator was situated far from the geographic equator an increase of the diurnal variation would occur.

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