lodestone
The Oxford Companion to Ships and the Sea
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2006
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© The Oxford Companion to Ships and the Sea 2006, originally published by Oxford University Press 2006. (Hide copyright information)
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lodestone, or loadstone, the seaman's name for magnetic oxide of iron. It is said that the ancient Chinese discovered that, when freely suspended, it would point to the north, and therefore used it to form the earliest crude
magnetic compass. Recent research suggests that this was not the case, although the Chinese were probably aware that a soft-iron bar, stroked with a lodestone, acquired a directional north–south property. There was, however, a long way to go before mariners were able to harness this directional property to a compass card. Presumably it was given its name from the old English
lad, as did
lodeman and
lodestar. Hitchens, H., and and May, W. ,
From Lodestone to Gyro-Compass (1954).
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News Wire article from: TendersInfo; 11/24/2009; 601 words
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News Wire article from: TendersInfo; 12/14/2009; 700+ words
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