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History of Electrical Technology

By Josie Jadamec

  • Relay

    Relay
    Widely regarded as the first electronic device, the relay was a remote switch controlled by electricity.

  • Telegraph

    Telegraph
    The telegraph, invented by Samuel Morse, enabled long distance communication for the first time and was used throughout the turn of the century.

  • Circuit Boards

    Circuit Boards
    Circuit boards are vital in more complex electrical technology, and were invented by Paul Eisler in the 1890s.

  • Radio

    Radio
    Though it had been theorized for several years before 1895, that is when the first working radio was built by Guglilmo Marconi.

  • First General Use Computer

    First General Use Computer
    Concepted in 1837 by Charles Babbage, Henry Babbage built a portion of the first computer.

  • Radio Classes

    Radio Classes
    In the 1920s, radio inspired on air classes, allowed students to learn remotely.

  • Projector

    Projector
    The first projector was invented in 1965 by David Hansen. Although the digital design of today is credited to Gene Dolgoff.

  • Overhead Projector

    Overhead Projector
    The overhead projector was invented in the early 1960s and was first used in classrooms in the 1970s and saw frequent used through the 1990s.

  • Handheld Calculator

    Handheld Calculator