Flinders bar

noun Navigation.
a bar of soft iron, mounted vertically beneath a compass to compensate for vertical magnetic currents.

1880–85; named after M. Flinders

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World English Dictionary
Flinders bar (ˈflɪndəz)
nautical a bar of soft iron mounted on a binnacle to compensate for local magnetism causing error to the compass
[C19: named after Matthew Flinders (died 1814), English navigator]

Collins English Dictionary - Complete & Unabridged 10th Edition
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