-
3000 BCE
Obelisk
A vertical structure with four sides used as a shadow clock -
500 BCE
Clepsydra
A water clock that used the flow of water to measure time. -
300
Sundial
A flat circle with a 12 hour clock face and a gnomon (vertical marker). -
520
Candle Clock
Notches were made in candles and the candle then lit, each notch representing a period of time. -
Dec 1, 1001
Hourglass Timer
Two upright containers joined with a narrow opening and a material inside one container, marking time by this material running out when being flipped over. -
Dec 1, 1300
Mechanical Clock
Clock using a system of weights and balances to mark out increments of time over a 12 hour period. -
Dec 1, 1400
Watch
Portable timepiece that people could carry and wear. -
Clock with Pendulum
A clock using a rod like weight that swings side to side and measures minutes and seconds. -
Digital Watch
A watch that displays the time digitally, in numerical form.