Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
8.6
Points
2.0
Fiction/Nonfiction
Nonfiction
Word Count
11730
Points per Word
0.000171
Page Count
80
Points per Page
0.025
Description
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.