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Results of Magnetic Survey in the Kakioka Magnetic Observatory Ground
In this paper, the author reports some results of the detailed and exact survey that had been carried out in the Kakioka magnetic observatory ground in 1955. Some magnetic anomalies on the small scale were found by this survey. Those anomalies were due to the topography in the observatory ground, accordingly the flatter the ground was, the more wide the interval of the lines of equal magnetic force was. The particularly great anomaly lay to the east side of the atmospheric observation house, and its amount was −146 gammas in the vertical intensity and −93 gammas in the horizontal intensity. The cause of this anomaly is considered to be presumably produced due to the well and its iron water-pipes. There were another several anomalies from 30 to 50 gammas, but they were due to the topography, such as the precipice, the hollow etc. They were not substantial.
The magnetically flat place are also topographically flat. The vicinities of the standard magnetometer house, the magnetic absolute house and the other observation house are comparatively flat.
It is desirable that the new observation house will be built on the topographically flat place.
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