AR Book Level
6.4
AR Points
1
Word Count
3,356
Interest Level
Middle Grades (MG 4-8)
Genre
Nonfiction
AR Quiz #
70103 EN

About this book

This book describes the need for sailors to be able to determine their position at sea and the efforts of John Harrison, an eighteenth century man who spent his life refining instruments to enable them to do this.

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