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Set in the exciting historical framework of the 18th century, this book chronicles the invention of a seagoing clock by John Harrison and the surrounding scientific, economic and political activity of 18th-century Great Britain. Petricic's black-and-white illustrations chart with levity Harrison's drive to solve the longitude problem with his clocks and his struggle to receive recognition for his ultimate achievement. A detailed glossary and concise timeline complement the book's biography and index.