radio
Tesla demonstrating wireless transmissions during his high frequency and potential lecture of 1891. After continued research, Tesla presented the fundamentals of radio in 1893
The identity of the original inventor of radio, at the time called wireless telegraphy, is contentious.
A click track is a series of audio cues used to synchronize sound recordings, often to a moving image. The click track originated in early sound movies, where marks were made on the film itself to indicate exact timings for musicians to accompany the film. It can be thought of as a recording of a metronome in that it serves a similar purpose.
Radio is a technology that allows for the transmission of signals by modulation of electromagnetic waves. These waves travel (propagate) through the air and the vacuum of space equally well, not requiring a medium of transport.
Copy of Alexander Graham Bell's original telephone, at the Musée des Arts et Métiers in Paris
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