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Evolution of Clocks

By hdiaz04
  • 160 BCE

    Sundials

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

    Hourglass

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

    Water Clock

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

    Astronomical Clock

    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.