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

At the centre of the coils is suspended a small magnetic needle the length of which should not be greater than 1⁄10 the radius of either coil.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" by Various

Such wandering gives rise to variations in the direction of the magnetic needle from year to year.

From Climatic Changes Their Nature and Causes by Huntington, Ellsworth