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Sea Clocks : The Story of Longitude
by Louise Borden and Erik Blegvad


Overview - "For hundreds of years ships had been sailing to places far and near without really knowing where they were "
Sailors knew how to measure latitude, their location north or south of the equator, but they could not measure longitude, their location east or west of their home port.
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More About Sea Clocks by Louise Borden; Erik Blegvad
 
 
 
Overview
"For hundreds of years ships had been sailing to places far and near without really knowing where they were "
Sailors knew how to measure latitude, their location north or south of the equator, but they could not measure longitude, their location east or west of their home port. Because of this, many lives were lost worldwide. The key to solving this problem lay in devising a clock that could keep absolutely accurate time while at sea, unaltered by rough water or weather conditions. With such a timekeeper sailors would be able to know the time back at their home port and calculate the longitude. But no one knew how to design such a clock.
John Harrison (1693-1776), an Englishman without any scientific training, worked tirelessly for more than forty years to create a perfect clock. The solution to this problem was so important that an award of 20,000 pounds sterling (equal to several million dollars today) was established by the English Parliament in 1714. Harrison won recognition for his work in 1773.
Together with beautifully detailed pictures by Erik Blegvad, Louise Borden's text takes the reader through the drama, disappointments, and successes that filled Harrison's quest to invent the perfect sea clock.


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Details
  • ISBN-13: 9780689842160
  • ISBN-10: 0689842163
  • Publisher: Margaret K. McElderry Books
  • Publish Date: February 2004
  • Page Count: 48
  • Reading Level: Ages 7-10
  • Dimensions: 10.36 x 8.28 x 0.44 inches
  • Shipping Weight: 0.93 pounds


Related Categories

Books > Science > Earth Sciences - Geography

 
BookPage Reviews

Solving a nautical puzzle

At first glance, longitude doesn't seem like a topic with the makings of a page-turner. But under Louise Borden's sure hand, children and adults alike will find themselves caught up in the amazing saga of an important scientific challenge when they read Sea Clocks: The Story of Longitude.

For centuries, sailors were able to measure latitude, their location north or south of the equator, by using the sun and the stars. But determining longitude was a different matter. Over the years, many lives were lost at sea through miscalculations. Eventually, it was determined that the solution to the problem was a clock that could keep absolutely accurate time so that sailors could know what hour it was back at their home ports. In this way, they'd be able to calculate longitude. But building a sea clock proved to be difficult, since rolling ships and weather all affected the timepieces.

In 1714 the English Parliament offered a reward of 20,000 pounds sterling (equal to several million dollars today) to anyone who could build an accurate sea clock. The man who ultimately solved the puzzle was John Harrison, an English clock maker. The arduous task of building the device became his life's work. Although he had no scientific training, Harrison, along with his son William, struggled for more than 40 years to create a working sea clock, or chronometer, that met the requirements. Harrison actually built four different models and was finally awarded the prize in 1773, just three years before his death.

In her new picture book, Louise Borden manages a feat almost as difficult as Harrison's by making his story dramatic and accessible to young readers and explaining in simple terms the complexities he faced. Borden appropriately keeps the focus on the inventor's struggle, while offering a clear explanation of the significance of his work. Erik Blegvad's watercolors bring an elegant, old-fashioned feel to the narrative. With an author's note, as well as a short section on some facts of Harrison's life story, this is a wonderful work of scientific history that young readers will love.

 
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