AR Book Level
8.6
AR Points
2
Word Count
11,730
Interest Level
Middle Grades (MG 4-8)
Genre
Nonfiction
AR Quiz #
64446 EN
About this book
This book explores the world before the invention of mechanical clocks; looks at the life of John Harrison, creator of the first accurate and portable mainspring clock; and discusses how the world has changed as a result of the invention.
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