From 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 Drawing on a wealth of unpublished sources-including manuals, treatises, sailing directions, and logbooks in a half-do...
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Sir George Clark discusses war as a factor for good and ill in European society in the seventeenth century. In particular, he shows how war helped to determine the emergence of modern Europe from a so...
Portugal is the oldest country in Europe.Situated at the very southwestern corner of Europe, Portugal is only about the size of Indiana. Yet despite its small size, it has a wealth of history and cult...