Title: Longitude Pdf The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time
Author: Dava Sobel
Published Date: 2007-10-30
Page: 208
“This is a gem of a book.” ―Christopher Lehmann-Haupt, New York Times“A simple tale, brilliantly told.” ―Washington Post Book World“As much a tale of intrigue as it is of science…A book full of gems for anyone interested in history, geography, astronomy, navigation, clockmaking, and--not the least--plain old human ambition and greed.” ―Philadelphia Inquirer“Only someone with Dava Sobel's unusual background in both astronomy and psychology could have written it. Longitude is a wonderful story, wonderfully told.” ―Diane Ackerman, author of A Natural History of the Senses“The marine chronometer is a glorious and fascinating object, but it is not a simple one, and its explanation calls for a writer as skilled with words as the watchmakers were with their tools; happily such a writer has been found in Dava Sobel.” ―Patrick O'Brian, author of The Commodore and the Aubrey/Maturin seriesDava Sobel is the bestselling author of Longitude, Galileo's Daughter, and The Planets, coauthor of The Illustrated Longitude, and editor of Letters to Father. She lives in East Hampton, New York.
The dramatic human story of an epic scientific quest and of one man's forty-year obsession to find a solution to the thorniest scientific dilemma of the day--"the longitude problem."
Anyone alive in the eighteenth century would have known that "the longitude problem" was the thorniest scientific dilemma of the day-and had been for centuries. Lacking the ability to measure their longitude, sailors throughout the great ages of exploration had been literally lost at sea as soon as they lost sight of land. Thousands of lives and the increasing fortunes of nations hung on a resolution. One man, John Harrison, in complete opposition to the scientific community, dared to imagine a mechanical solution-a clock that would keep precise time at sea, something no clock had ever been able to do on land.
Longitude is the dramatic human story of an epic scientific quest and of Harrison's forty-year obsession with building his perfect timekeeper, known today as the chronometer. Full of heroism and chicanery, it is also a fascinating brief history of astronomy, navigation, and clockmaking, and opens a new window on our world.
Precise Writing on Precision Longitude is west to east, east to west. But it's not that simple because, for example, the equator is wider around the earth than the Tropic of Capricorn or the Arctic Circle. Although latitude is fixed by the earth and Columbus could sail a "straight line" in 1492 relative to a fixed latitudinal parallel, longitude made sailors feel they were on a train and looking at another train, trying to determine which one just began moving.After reading a book about Mason and Dixon and all of the incredibly (for me) complex math and astronomy involved, I was slow to begin this book. Author Dava Sobel, however, cuts through all the more complicated principles like a good pre-calculus teacher. I would even suggest this book could appeal to adventurous 8th graders. The history is impressive. The Harrison family were watchmakers, but as very precise and diligent watchmakers competitive with the Royal Society and haughty astronomers like Nevil Maskelyne. John Harrison had size, cost, material, temperature fluctuations, moisture, waves, and many more atmospheric obstacles to confront while those relying on lunar readings went much further to produce much less. For the record, I had never heard of John Harrison. His predecessors include Halley, Tycho Brahe, and Galileo, whose attempts to time the speed of light is briefly retold here.This is summer reading, a hero's tale, good defeating bad, The Little Engine that Could. If you or your child is interested in sailing, navigation, astronomy, inventions, machining, or how the British came to rule the word for a time, this is a book to read and re-read.I was left hoping for more detail and depth I was left hoping for more detail and depth. This story is sort of a biography about a person whom the author explains there is not much known. The subject's work product is and has been well known and studied at length, but there are not enough details about the technology included in this book. At the end of the book the author explains that she purposefully omitted information that she did not think her readers are smart enough to consider. The premise of using a clock to compute longitude is mentioned repeatedly through the first half of the book, but an explanation of the operating principal and technique is only finally hinted at in the later stages of the book. The idea is that at any instant one can correlate "local" time to some known "reference" time as it occurs at some specific reference location and compute the local angle of longitude in relation to the reference location. The clocks being discussed are the devices used to reliably transport the "reference" time for comparative use in other locales. I have been aware of the technique for a long while and it became a guessing game to anticipate when the idea was finally going to be presented to, and shared with, readers. I think that many readers will enjoy the book much more if the premise is described, in detail, in an earlier portion of the story so that it is more obvious why one may appreciate all the great efforts made in the field of horology to achieve a series of incremental advances in performance and reliability. This book reads like a book report or a term paper rather than as a comprehensive book. It seems as if the author knows her subject well, but did not benefit from effective editing and/or insightful guidance regarding the perspective of a reader when formatting the story line into book form. I am surprised that some other more satisfying explanation of the history and circumstances has not been offered as a replacement for this book and its best seller status.One of the most fascinating books I have read In the age of GPS it is hard to believe that there was a time when sailors could not navigate the seas in safety. This book is so interesting and easy to read, yet it explains the discovery of how to determine Longitude in a way that is fascinating for adults and excellent for young teenagers as well. I always have three copies of the Illustrated book on hand. I give them as gifts all the time. I read this book while I was traveling and I had the opportunity to visit the The Royal Naval Museum, in Portsmouth's Historic Dockyard, England, that houses these wonderful clocks. One of my favorite books.
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