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55 of 58 people found the following review helpful:
5.0 out of 5 stars
The Dramatic Beginnings of the Metric System, October 29, 2002
What do the United States, Myanmar, and Liberia have in common, as opposed to every other nation in the world? The answer is that they are the only nations not to have embraced the metric system. Inevitably, they will; their scientists all use it, and cars are made by it, and trading with other nations requires it. The inevitability of victory of the metric system is something Napoleon himself recognized: "Conquests will come and go," he declared, "but this work will endure." The work he spoke of was the defining of the meter, and it was a task begun in the final days of the French monarchy. In 1792, two French astronomers set out separately on the quest to make an accurate measurement of the globe, a measurement that would enable people to use the constant of the size of the globe as the foundation for rational weights and measures. Their plan was to measure enough of the distance of a north-south meridian through Paris that they would then be able to calculate the distance from the equator to the north pole, and one ten-millionth of that natural distance would be the meter. They aimed for unprecedented precision, and they got it, but they didn't get it exactly, for fascinating reasons all wonderfully told in _The Measure of All Things: The Seven-Year Odyssey and Hidden Error That Transformed the World_ (The Free Press) by Ken Alder. It seems a simple task; a line of longitude from Dunkirk south to Barcelona would be mapped and calculated by triangulating high points, like mountains and steeples, along the line. In practice, it was devilishly, maddeningly, and lethally difficult. Weather, disease, the ravages of time, superstition, politics, and war all conspired to make the work of a few months stretch into years. The astronomer Delambre, heading north, was mistaken for an aristocrat, detained, and suspected of using a church tower as a royalist beacon. His partner Méchain, who took the southern route, had similar problems, and worse ones, as war with Spain erupted while he was in Spain. He had a fiendish obsession with exactitude, and made measurements of Barcelona's latitude by reckoning from the stars. Unfortunately, they were wrong due to refraction from the atmosphere, and Méchain knew they were wrong, but couldn't get them right. The knowledge of the error tortured him for the rest of his life. Méchain's error is not the error referred to in the book's subtitle. All the triangulation work had shown that the critics had been right from before the beginning, for the work could not produce a perfectly precise meter; the world was too irregular for that. The astronomers' work had produced, however, documentation of the more interesting fact of Earthly irregularity. This story could not have been presented in a more dramatic and entertaining manner. An epic about the foundation of the metric system might seem to be impossible, but Alder has made the personalities interesting. He has also made clear the process of triangulation, the equipment required, and the scientific philosophy of what an error actually is. He has well described the history of the period, and the failures of the French Revolution, such as the calendar containing twelve months of three ten-day weeks each, or the clock with ten one-hundred minute hours in a day. Beside the origin of the admirable metric system of weights and measures, Alder has also given a brief history of how the world has adopted the system, which Americans ought to know about, since, with reluctance, we are having to use it more and more
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28 of 30 people found the following review helpful:
5.0 out of 5 stars
The Basis of Measurement, December 30, 2002
This is another book in the tradition of Dava Sobel's Longitude--taking a relatively unknown but important event in scientific history and describing the drama of discovery. In this case, Ken Alder has decided to tell the story of Mechain and Delambre, two "savants" who were charged with determining the length of the meter. Originally, the meter was defined to be one ten-millionth of the distance from the north pole to the equator. So Mechain and Delambre set out to measure the length of the meridian more accurately than had ever been done before. Like the best books about science, The Measure of All Things shows the nature of real science. First, that science is performed by real people like Mechain and Delambre with their own strengths and foibles; it does not just appear miraculously in textbooks. Second, the development of science is influenced by the history of the time such as the revolutionary period in France through which most of this story takes place. But because this book is describing the determination of the meter--the basis of the scientific measurement system--it shows other important aspects of science that are often forgotten. For example, the important idea that how we measure things is ultimately completely arbitrary. Despite our natural desire to find the "absolute" meter, there is no such thing as Mechain and Delambre discover. We can choose the length of the meter to be whatever we want as long as--and here's the difficult part--we get everyone to agree. The problems of getting the meter accepted, even in France where it was developed, is a fascinating part of this book. The cover of my edition of this book touts the "hidden error that transformed the world." This is a bit of marketing strategy to entice those, I think, who like to read about other's mistakes. But, as a scientist, I see this notation of error as being a part of what science is. Modern science understands that measurement is never error-free but this was not always understood and bothered scientists like Mechain. It is very worthwhile for non-scientists to see how scientists learned to deal with the fact that there are always limitations to their measurements. Anyone interested in the importance of measurement in science would be amiss is passing this book by. Alder has provided a readable account of the development of the basis of our modern, nearly-universal method of measurement. It is definitely worth a read.
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10 of 11 people found the following review helpful:
3.0 out of 5 stars
Measure, but no details, October 22, 2005
I have no hesitation in recommending this book to just about any interest or level of scientific knowledge or background. There is a wealth of information that is generally little known. How many of us knew that metrication was a unifying factor beyond simply the impaired meter measurement? How many of us knew that the most advanced nation in the world, the USA, is one of few hold-outs in the world (along with N. Korea, for instance) that have not accepted metrication -- and screwed up a very expensive Mars landing expedition as a consequence?
Why only three stars? I'm sorry Mr. Alder, but I bought your book primarily because I wanted to know how the two guys did it -- but you didn't tell me in any detail! OK, so this was not intended as a text book and if it had been packed with all the geometry it would not have sold as well. But even so, surely we should have been provided with some access. An appendix with some example calculations would have been welcome. How about a web site reference to the detailed mathematics? It is a great wonder to me how these guys managed to do all these detailed calculations when all they had was stylus and paper. And the precision to which they worked was very great, requiring either reams of trigonometric tables or very tedious calculations for every trig function they used.
It took me a long time to read this book, because I spent a lot of time on the Internet trying to find references to how they performed their calculations. Surprisingly I found nothing significant. So Mr. Alder, having researched all the original papers, missed an oportunity to enlighten us. I think how they did the calculations to the precision they were able would have been at least as interesting a story.
Perhaps you can add this as a sequel, Mr. Alder...
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