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Evolution of Clocks

By hdiaz04
  • Sundials
    160 BCE

    Sundials

    Sundials show time by projecting a shadow on a flat surface with lines to count as hours.
  • Hourglass
    150 BCE

    Hourglass

    A hourglass measures time with fine sand going through a small hole at a constant rate.
  • Water Clock
    130 BCE

    Water Clock

    Water clocks display time by any flow of water/liquid into a holder which it is measured.
  • Astronomical Clock
    1336

    Astronomical Clock

    An astronomical clock shows time by display the sun, the moons age, phase, a star map and sometimes the planets.
  • The Hairspring

    The Hairspring

    The Hairspring was invented to control the oscillating speed of the balance wheel.
  • Early Electric Clocks

    Early Electric Clocks

  • Atomic Clock

    Atomic Clock

    The atomic clock was based on past ideas of the clock.