Before the discovery of electromagnetic waves and the development of radio communication, there were many wireless … See more

Various scientists proposed that electricity and magnetism were linked. Around 1800 Alessandro Volta developed the first means of producing an electric current. In 1802 Gian Domenico Romagnosi may have suggested … See more

During 1789–91, Luigi Galvani noticed that a spark generated nearby caused a convulsion in a frog's leg being touched by a scalpel. In different experiments, he noticed contractions in frogs' legs caused by lightnin… See more

In 1890, Édouard Branly demonstrated what he later called the "radio-conductor," which Lodge in 1893 named the coherer, the first sensitive device for detecting radio waves. Shortly after the experiments of Hertz, Branly disc… See more

In 1894–95 the Russian physicist Alexander Stepanovich Popov conducted experiments developing a radio receiver, an improved version of coherer-based design by Oliver Lodge. His design with coherer auto-tapping me… See more