Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time by Dava Sobel

My kingdom for a clock!

Long before the days of ubiquitous GPS devices, when sailors first started voyaging to distant parts of the world, it was very difficult to determine just exactly where one was. While latitude could be determined by measuring the height of the midday sun above the horizon, longitude was quite a bit trickier. Without an accurate determination of longitude, ships could not only get lost aimlessly at sea but also wrecked on the shorelines of unforeseen islands and continents. This was such a costly and frustrating problem that in the early 18th century, England, the world’s leading maritime power, established a Board of Longitude to encourage efforts to find a solution to the longitude puzzle. The Board promised a large cash prize to whomever could come up with a reliable and accurate method for determining longitude. The book entitled Longitude by science writer Dava Sobel, published in 1995, recounts the story of the long and arduous quest to solve the longitude problem and claim the prize.

The surest method for finding longitude is to compare the solar time (noon, for example, the point when the sun is highest in the sky) of a known point (usually the port of departure) with that of your present location. Just as modern time zones tell us that New York is roughly an hour ahead of Chicago, the difference in minutes and seconds between point A and point B can be converted to a measurement of degrees indicating how far east or west you’ve traveled. The only way it is possible to measure this, however, is if you have an accurate timepiece that can remain synchronized to the exact solar time of your home port. Up to the early 1700s, this was not possible because there weren’t any clocks that could keep sufficiently accurate time when subjected to shipboard motion and temperature changes. What was needed was something we take for granted these days: a reliable timepiece. An English carpenter and self-taught clockmaker named John Harrison (1693–1776) set about to create such a marine chronometer that could withstand seaborne conditions and allow for accurate and reliable navigation. Harrison would end up devoting decades of his life to the project. 

Longitude was a New York Times bestseller and won several prestigious book awards. It is deliberately written for an audience of general readers, perhaps too deliberately at times. This is a very small and short book that one can read in a day or two. It’s written at about a high school vocabulary level. Wherever possible, complex scientific concepts are explained in layman’s terms, and there are no footnotes or endnotes. Longitude is at its best when it’s discussing the biography of Harrison and all of the politics behind the awarding of the coveted prize. It’s not so great, however, at explaining how exactly geographical coordinates are measured or what mechanical advancements made Harrison’s clocks so special. In the interest of simplification, such topics are glossed over in a sentence or two so as not to strain the brains of casual readers. Some simple black and white diagrams might have been helpful, but the book has no illustrations. Perhaps such diagrams would intimidate prospective readers by being too “sciency.” The result of too much popularizing is that the science and mathematics behind this story get inadequate and what feels like half-baked coverage. This is science history that succeeds as history; it’s about scientists but not so much about science.

The story of John Harrison is really fascinating, and this book made me want to learn more. Longitude is much like a National Geographic article (albeit a long one). You know you’re not getting quite the full story because the account has been condensed for reasons of space and accessibility. Nevertheless, you still learn a lot, enough to satisfy most curious general readers and pique the interest of those willing to pursue the subject further.

The Fate of the Corps: What Became of the Lewis and Clark Explorers After the Expedition by Larry E. Morris

The later lives and deaths of America’s intrepid explorers

I’ve read a few books recounting the 1804–1806 expedition of Lewis and Clark and their Corps of Discovery across America to the Pacific Coast and back. Stephen Ambrose’s Undaunted Courage is an excellent summation of the voyage, and the original 1814 published account of the journey, edited by Nicholas Biddle and Paul Allen, certainly yields many interesting details. The most complete account to date would be the 13-volume edition of the Journals of the Lewis & Clark Expedition edited by Gary E. Moulton, which you can either buy for a few hundred dollars or read online for free. Following up on all of these accounts of the expedition, Larry E. Morris’s 2004 book The Fate of the Corps takes a unique and interesting look at the Corps of Discovery by asking what happened to all these guys after the expedition was over?

In addition to Meriwether Lewis, William Clark, and the men they assembled for the journey, the scope of Morris’s study includes Clark’s slave York, as well as Native American guide and interpreter Sacagawea and her French-Canadian husband Toussaint Charbonneau, both of whom joined the expedition in midstream. Morris considers 34 people to be the core of the Corps, and he investigates each of their post–expedition lives. Along the way, many other recognizable historical figures who associated with Corps members are brought into the narrative, including Daniel Boone, Davy Crockett, Stephen Austin, Sam Houston, and about a half dozen U.S. Presidents. Lewis and Clark’s team members took up a variety of roles after the Corps split up—fur trappers, farmers, soldiers in the War of 1812 and the Mexican-American War, lawyers, politicians, and more. In learning about the lives of these Corps members, one learns quite a bit about the broader history of 19th-century America, Western expansion, and Native American relations.

While the lives many of these figures led were quite fascinating, their deaths are often equally intriguing and sometimes poignantly tragic. The best-known case is the death of Lewis himself, who exhibited signs of mental illness and committed suicide (or, as some argue, may have been murdered). Clark, on the other hand, lived a longer life in which he held important political positions in the West and also served as the guardian of Sacagawea’s children. Morris examines Clark’s attitude toward Native Americans (somewhat progressive for his day) and his problematic relationship with his slave York (not the least bit progressive).

I recently read Robert M. Utley’s 1997 book A Life Wild and Perilous, a history of “mountain men” that covers similar subject matter and several of the same individuals as Morris’s book. I found Utley’s storytelling very confusing and rather boring. Morris, on the other hand, really brings these characters to life. The biographical scenes are lively, often exciting, and sometimes moving. Morris’s accounts are grounded in fact, but they don’t read as simply a relentless barrage of facts. Morris does jump around quite a bit, chronologically and geographically. There a lot of life threads intertwined here, which can sometimes be disorienting. Unlike Utley, however, Morris assists the reader by providing a useful chronology up front and an appendix that recaps the pertinent details of each member of the Corps. As a result, you come away from this book knowing exactly what happened to these men and woman (except in cases where nobody knows exactly what happened to these men and woman). When there are conflicting views among historians about the ultimate fates of, for example, Lewis and Sacagawea, Morris explains the pros and cons of each side’s arguments.

If you want a history of the Lewis and Clark Expedition, this isn’t it. Read Ambrose or Biddle’s books. If that’s not enough to satisfy your interest, however, and you’d like to follow the ripple effects of that landmark journey through subsequent American history, then Morris’s The Fate of the Corps is a great read that will tell you everything you want to know and more.