Bøger i Breakthrough Inventions S. serien

Intended for ages 9-12, this book describes the evolution of the telephone from the invention of the telegraph by Marconi to the modern day cell phones that have become a popular part of our everyday life. It also takes a look at: how the telephone works; early inventors and those who continue to enhance the technology; and more.

Documents the earliest experiments with radio waves to the arrival of podcasting. This work includes topics such as: how people communicated information before radio; Reginald Fessenden's first voice transmission; early radio stations and the advent of commercials; ham radio operators; and, the Golden Age of radio broadcasting.