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3500 BCE
Obelisks
An obelisk was being used to telling time using the shadow cast by the sun. -
1500 BCE
Sundial
The Egyptian's created a sundial or shadow clock to tell times of day. There clock had 10 sections for hours. -
600 BCE
Merkhet
Ancient Egyptians used this astronomical tool to monitor night time hours passing by. -
325 BCE
Water Clocks
Ancient Greece began using water clocks to calculate a time passing by. -
Pendulum Clock
Created by Dutch Scientist Christian Huygens, the pendulum clock had a natural oscillation and had a margin of error of 1 minute a day. This was the beginning of mechanical clocks. -
Pocket Watch
John Harrison invented a small clock. The pocket watch would only lose 5 seconds every 6 and a half weeks. -
Mechanical Clock Reproduction
Eli Terry created machines to mass reproduce the parts of clocks exactly the same. -
Wristwatches
The wristwatch was invented and was used by men in the first world war. -
Digital Alarm Clock
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Quartz Crystal Clock
The clock oscillated using quartz and was created by Walter G. Cady. -
Atomic Clock
This clock was created by scientist and creates time through the oscillation of atoms and is the most accurate clock.