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Francisco Romero
We tend to remember hymns one at a time
and the famous Seven Falls
Jared Diamond
Earth's Magnetism in the Age of Sail Kevin M McCarthy Francisco RomeroFrom about 1600 to 1800 scientists and mariners made increasingly sophisticated attempts to understand the earth's magnetic field and use it in navigation. Europeans had long understood the difference between magnetic and true north, but why did it vary as one traversed the sea? Could this variation be used to pinpoint longitude? Drawing on a wealth of unpublished sourcesincluding manuals, treatises, sailing directions, and logbooks in a half dozen
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