Jackspeak of the Royal Canadian Navy

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Nelson's Balls

The iron spheres positioned on either side of a magnetic compass, designed to correct magnetic errors caused by the ship itself. Usually they're painted green and red. Named after Admiral Horatio Nelson. Incidentally, in the RN, they're called "Lord Kelvin's Balls".

Added: 2014-11-01 Last modified: 2014-11-01

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Jackspeak of the Royal Canadian Navy
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