Mercury's web: the story of telecommunications
Discusses ways in which we communicate and describes how messages are interpreted to provide information. Also examines the use of electronic impulses to send, receive, process, and store information.
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The Gift of the Gods
Smoke Signals and Silicon Chips
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analog signal antenna Appleton bandwidth battery beam bits cable called carrier frequency changing magnetic field channel communication satellites communication systems computers connected copper link current flows current to flow developed device digital signals distance earth elec electric current electric field electricity and magnetism electromagnetic waves electrons fiber filament FM radio grid ground station Hertz hydrogen atom invention kind language letters Lord Kelvin's magnetic field Marconi Maxwell Maxwell's means mirror modulation Morse mosquero moving noise operation optical orbit p-type semiconductor particles photons picture plate pointer positive charge possible problem produce pulses quency radio signal radio waves receiving end scientists screen selenium sent shown in Figure signal space signal strength silicon speed of light strings Suppose switch symbols telegraph telephone television tion transistor transmission transmit triode TV set TV signals vacuum tube vibrate voice wire words zyzzyva