Dip CircleDip circles (also dip needles) are used to measure the angle between the horizon and the Earth's magnetic field (the dipangle). They were used in surveying, mining and prospecting as well as for the demonstration and study of magnetism.
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Dip circles(alsodipneedles) are used to measure the angle between the horizon and the Earth's magnetic field (thedipangle). They were used in surveying, mining and prospecting as well as for the demonstration and study of magnetism.