A Flinders bar is a vertical soft iron bar placed in a tube on the fore side of a compass binnacle. The Flinders bar is used to counteract the vertical magnetism inherent within a ship and is usually calibrated as part of the process known as swinging the compass, where deviations caused by this inherent magnetism are negated by the use of horizon...
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http://en.wikipedia.org/wiki/Flinders_bar
(from the article `navigation`) ...caused by the magnetism of the ship. These usually consist of properly placed magnets, a pair of soft iron spheres (or small strips close to the ...
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http://www.britannica.com/eb/a-z/f/37
a bar of soft iron, mounted vertically beneath a compass to compensate for vertical magnetic currents. See diag. under
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https://www.infoplease.com/dictionary/flinders-bar
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