Earth's Magnetism in the Age of Sail Kevin M McCarthy and built on primary source

and built on primary source material that allows DeBerdt Reed’s own voice to shine

In depth-coverage of big data

so all students can achieve their full potential

when available

Francisco Romero

Earth's Magnetism in the Age of Sail Kevin M McCarthy and built on primary sourceFrom 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 Drawing on a wealth of unpublished sourcesincluding manuals, treatises, sailing directions, and logbooks in a half dozen