Location : Cleveland, OH
One of the most pressing issues for early sailors was the problem of longitude. Because it was impossible to determine longitude, many ships and sailors died. Also, captains used the same routes as pirates or enemies of the state, which made it easy to lie in wait for your next victim. In 1714, English Parliament passed the Longitude Act which created an award for the first person to accurately determine longitude. Longitude, by Dava Sobel, explores the work of John Harrison, the man credited with accurately determining longitude for ships at sea.
Contents:
Acknowledgements
Foreword, Neil Armstrong
Chapter 1: Imaginary Lines
Chapter 2: The Sea Before Time
Chapter 3: Adrift in a Clockwork Universe
Chapter 4: Time in a Bottle
Chapter 5: Powder of Sympathy
Chapter 6: The Prize
Chapter 7: Cogmaker's Journal
Chapter 8: The Grasshopper Goes to Sea
Chapter 9: Hands on Heaven's Clock
Chapter 10: The Diamond Timekeeper
Chapter 11: Trial by Fire and Water
Chapter 12: A Tale of Two Portraits
Chapter 13: The Second Voyage of John Cook
Chapter 14: The Mass Production of Genius
Chapter 15: In the Meridian Courtyard
Sources
Index
Today, ships have GPS to tell them where they are on the seas. But before John Harrison created his first sea worthy clock, sailors were pretty much lost at sea as soon as they lost sight of land. Watches were not accurate and clocks worked on a pendulum, which didn't help on a rolling sea. Sobel weaves an interesting tale of John Harrison, a carpenter turned clockmaker, who created an extremely accurate clock for determining longitude. But this story isn't solely about Harrison. There are others that are attempting to do the impossible as well, using the heavens to find longitude. Harrison must battle prejudice, and himself, to get his timekeeper judged for the prize (£20,000 is the award). In the end, Harrison developed several chronometers, extremely accurate and able to withstand the seas and weather, that by the 1780's all log books had an entry for longitude readings by timekeeper.
This is a topic that many may not find interesting. But Sobel hasn't written an academic dissertation on the subject, she has created a highly engaging study of a man dedicated to solving one of the greatest issues facing the world at the time. Her writing style makes this an easy book to read, as there are few technical details. However, for those that need more information, she provides a rather detailed source listing. I found the book to be a fascinating look at early sailing and the answer to a problem that plagued those sailors. Also, the background on Harrison adds to the story. While he worked as a carpenter, his knowledge of wood aided him in his quest for an accurate timekeeper. His chronometer was accurate to less than a second, in the 1700's, when other, more learned clockmakers could only be accurate to 15 minutes a day (plus or minus).
This is a very good, enjoyable book on a fascinating subject.
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