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Matthew Flinders and Ship Magnetism
Published online by Cambridge University Press: 23 November 2009
Extract
It appears that the earliest recorded reference to the effect of the magnetism of a ship or her fittings on the magnetic compass was made by the Portuguese explorer João de Castro in his Roteiro de Lisboa a Goa of 1538. João noticed that the compass he used to observe for variation was affected by iron objects on board placed near to the compass.
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- Copyright © The Royal Institute of Navigation 1976
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