The Measure of All Things The Seven-Year Odyssey and Hidden Error That Transformed the WorldKen Alder
Free Press 2002WorldCat • Read Online • LibraryThing • Google Books • BookFinder
In today’s world, we take for granted that a gallon of milk is the same in New York and Los Angeles, that you can buy the same yard of cloth in Boston or Baton Rouge, that a pound of cheese, a pound of paper, and a pound of steel all have the same weight. But, this standardization is a relatively recent phenomenon.
The systems of measurement we use in the United States today are the product of distillation of a plethora of more or less standard English units. These units were in turn derived from older Roman, Saxon, and Celtic units. These units were often specific to the thing being measured. As a result, there were many different and often incompatible units for measuring the same thing, i.e. feet, cubits, ells, fathoms, rods, furlongs, leagues, and miles — all of which measure length or distance.
The unified system of measurement employed by most of the rest of the world — the metric system — has no such diverse origins. During the Enlightenment period in Europe, equality and the building of an international community were hot topics. For these ideals to be realized, standards had to be established. It is unsurprising that the French, who were restlessly forward-thinking at the end of the eighteenth century, planed and executed the most ambitious plan for establishing a unified standardized system of measurement. With the idea of creating a system that would be relevant world-wide, they decided to derive the fundamental unit from the earth itself.
Alder tell the story of the planning of the new system, the expedition that set out to measure the planet, and the struggles to convince governments and the general public to adopt the metric system. France’s top two geodesers, Jean-Baptiste-Joseph Delambre and Pierre-François-André Méchain, were sent to measure the meridian between Barcelona and Dunkerque. From this, they would extrapolate the distance between the equator and the north pole, and one ten-millionth of this distance would become the meter.
Obtaining a very precise measurement of the meridian at this time required the use of triangulation and hundreds of elevated observation points. During their journeys, which ended up taking seven years, Delambre and Méchain were incessantly beset by bad weather, suspicious villagers, constantly changing French regimes, and warring European nations. Observation towers they built were blown over, burnt down, and dismantled. They also ran into trouble when their data revealed new information about the size and shape of the planet (troublesome because the significance was not easily grasped, and the data initially appeared flawed).
Alder does a good job of exploring the story from political, scientific, and social angles. Not only does he relate the events, he also details the far-reaching significance of the work of Delambre and Méchain. Alder reminds us that an object as mundane as a ruler can have a complex and fascinating history.