The telephone
an account of the phenomena of electricity, magnetism, and sound, as involved in its action. With directions for making a speaking telephone
30 min read
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About This Book
This fascinating series offers a comprehensive and cross-curricular look at scientific inventions. Each title explores the principal stages in the development of one life-changing invention, and traces its story from conception and prototypes, to revisions and the modern day. Ages 8-12.
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