Radio

radios over time- chevelle moysis

By cmoysis

  • The Idea Of Radio Waves

    The Idea Of Radio Waves
    A scientist named James Clerk Maxwell thought there might be invisible waves that could travel through the air. This theory would be the start of radios.

  • Radio Waves Are Real

    Radio Waves Are Real
    Heinrich Hertz proved Maxwell was right by creating and detecting these invisible waves, now called "radio waves."

  • First Radio Signal

    First Radio Signal
    Guglielmo Marconi sent the first wireless message using radio waves.

  • Radio Signal Across the Ocean

    Radio Signal Across the Ocean
    Marconi sent the first radio signal across the Atlantic Ocean. This was from England to Canada.

  • First Voice and Music Broadcast

    First Voice and Music Broadcast
    Reginald Fessenden used the radio to send a voice and music broadcast on Christmas Eve. People could hear his voice instead of just beeps.

  • First Radio Station

    First Radio Station
    KDKA is a radio station in Pittsburgh. It broadcasted the results of the United States presidential election. This was the first ever commercial radio station.

  • FM Radio Was Invented

    FM Radio Was Invented
    Edwin Armstrong created FM radio. This made sound much clearer than the AM radio.

  • The Invention of the Transistor

    The Invention of the Transistor
    The transistor made radios smaller and cheaper, so more people could own them. This made it so that radios could be portable.