dip needle

noun

Definition of dip needle

  1. 1 or dipping needle :  a magnetic needle pivoted to rotate in the vertical plane of the magnetic meridian with its rotation axis through its center of gravity so that it points in the direction of the earth's magnetic intensity

  2. 2 :  an instrument similar to a dip needle but with a counterweight so adjusted as to give the needle maximum sensitivity to changes in the magnetic dip

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