On Amazon's Big Deal, they are offering LONGTITUDE by Sobel for 2.99. It was highly regarded when it first came out.
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Blurb:
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Amazon.com Review
The thorniest scientific problem of the eighteenth century was how to determine longitude. Many thousands of lives had been lost at sea over the centuries due to the inability to determine an east-west position. This is the engrossing story of the clockmaker, John "Longitude" Harrison, who solved the problem that Newton and Galileo had failed to conquer, yet claimed only half the promised rich reward.
From Publishers Weekly
This look at the scientific quest to find a way for ships at sea to determine their longitude was a PW bestseller for eight weeks.
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