magnetic needle

Example Sentences

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Finding the magnetoreceptors responsible for triggering these neurons has been like looking for a magnetic needle in a haystack.

From Science Magazine • Jun. 23, 2016

He said: "Nothing must deflect the magnetic needle."

From Time Magazine Archive

Last week Bendix Aviation Corp. announced a new automatic compass that makes the old magnetic needle* look as obsolete as a warrior's spear.

From Time Magazine Archive

As we have already mentioned, the variations of the magnetic needle have a period of the same length, its greatest variations occurring when there are most sun-spots.

From Meteorology or Weather Explained by M'Pherson, J. G.

Circumferent′or, an instrument used by surveyors and miners for measuring horizontal angles, consisting of a graduated circle, an index, and a magnetic needle suspended over the centre of a circle—now superseded by the Theodolite.

From Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) by Various