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dip circle

scientific instrument
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Also known as: dip meter, dip needle, inclinometer
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Also called:
Dip Needle, or Inclinometer

dip circle, instrument for measuring the inclination, or dip, of the Earth’s magnetic field. It consists essentially of a magnetic needle pivoted at the centre of a graduated circle. The assembly is mounted such that the needle swings vertically rather than horizontally, as does a compass needle. When the instrument is placed with the plane of the circle in the magnetic meridian of the Earth, the needle points in the direction of the Earth’s magnetic field.

This article was most recently revised and updated by John P. Rafferty.