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Clock Timeline

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Del Mar Heights5

on 19 November 2016

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Transcript of Clock Timeline

The Sundial
The sundial was first made in ancient Egypt at 3500 BC. It uses the shadow cast from the Sun on a small needle to estimate time.

The Hourglass
(The Sand Clock)
The Hourglass (or Sand Clock) appeared in 300 AD. It is an inverted device that has a specific amount of sand, depending on how long the creator wanted it to time. For example, an hourglass that the maker wanted to last for one minute, the sand would have to completely drop from the top section to the bottom in one minute.
The Water Clock
The first water clock, also known as the clepsydra was made in 1092, by a Chinese innovator named Su Sung. There are two types of water clocks outflow, and inflow.

The Grandfather Clock
(Pendulum Clock)
The first grandfather clock was invented by a British inventor named William Clement in 1680. It is a wooden case with a clock inside, driven by weights.


The first electric, modern clock (Quartz Clock) was created by Frank Hope-Jones in 1927. It has become the inspiration for all modern clocks today. The quartz clock is based on the properties of the quartz crystal.

The Modern Clock
( Quartz Clock)
The
CLock

TImeline
By

Angelina
,
Dylan
,

Caden,
and
Julia

The Atomic Clock

The atomic clock was invented by The National Institute of Standards and Technology (NITS) in 1949. It tells time based on the vibrations within an atom.

Sources:
http://www.historyofwatch.com/clock-history/clock-timeline/
http://www.infoplease.com/ipa/A0855498.html
http://wiki.kidzsearch.com/wiki/Atomic_clock
https://www.britannica.com/technology/grandfather-clock
http://www.historyworld.net/wrldhis/plaintexthisto ries.asp?historyid=ac08
http://inventors.about.com/od/cstartinventions/a/clock.htm
http://www.andersoninstitute.com/history-of-the-clock.html







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