Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time - Chapter 10: The Diamond Timekeeper Summary & Analysis

Dava Sobel
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Chapter 10: The Diamond Timekeeper Summary and Analysis

We do not know why Harrison took so long to build the H-3. It looks as if he did nothing but work on it. Harrison's son grew up as his father was building the H-3 and aided his father with these clocks until he was 45. The H-3 has 753 working parts and possessed numerous innovations that would balance against temperature and friction problems. H-3 weighs only sixty pounds and has a simpler core design. While Harrison is building the H-3, he comes in contact with John Jefferys, a freemason, who made Harrison a pocket watch built from Harrison's design. Jeffreys stays in contact with Harrison until the H-4 is finished.

H-4 is five inches in diameter and is absolutely beautiful, including diamond mechanisms and a silver case. We do not know how the watch was jeweled...

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This section contains 243 words
(approx. 1 page at 400 words per page)
Buy the Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time Study Guide
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