The history of clocks

By kozloski123
  • Sun Watch
    3500 BCE

    Sun Watch

    The Egyptians made the first sundial, in which the shadow formed by the staff indicates the hours throughout the day
  • water clock
    725 BCE

    water clock

    in China a mechanical clock was developed that had a complex gear system and 60 buckets of water corresponding to 60 seconds
  • clepsidras and hourglasses
    600 BCE

    clepsidras and hourglasses

    Water and sand clocks were developed in Babylon, Egypt and Judea.
  • Period: 200 BCE to 101 BCE

    time count

    division of the day in 24 hours based on the equinoxes and segmentation in 60 minutes, each with 60 seconds with the studies of the Greek astronomer Eratosthenes.
  • 1000

    first mechanical clock

    about 1200 in northern europe, but there are records in asia too
  • 1335

    Public clock

    in Milan, the first public clock that marked the hours was erected
  • pocket clock
    1500

    pocket clock

    first pocket clocks unveiled, precursors of: spiral spring
  • 1580

    pendulum clock

    from the studies of Galileo the pendulum clock was created
  • Wristwatch

    Wristwatch

    possibly created by santos dumont becoming popular at the end of the second world war
  • Period: to

    quartz clock

    diffusion of quartz watches where mechanical vibrations of this mineral are used
  • atomic clock

    atomic clock

    the second was redefined as the duration of 9,192,631,770 periods of radiation resulting from the energy transitions of the cesium atom
  • digital clock

    digital clock

    first commercially launched using piezoelectric crystal, capable of generating electrical pulses at a constant frequency (usually 50 or 60 Hz
  • digital technology

    digital technology

    Advances in digital technology have evolved clocks