1. The Evolution of The Clock
PowerPoint Created By Kevin
Kubis and Sidath Wanigasinghe
2.
3. The Sundial
• The sundial was created in 3500 BC and
was the first instrument to measure time. It
was also the oldest scientific device. The
sun creates the shadow on the sundial
that can be used to tell what time it is.
4. The Hourglass
• The was created some time in the 14th
century. The sand falls through at a
certain rate so people can be able to
know how much time is passing.
Different sized hourglasses are used
for different amounts of time.
5. The Waterclock
• The water clock was created in 325 BC
and one of the first clocks that was
ever made. Water would drip down at a
constant pace and collect at the bottom
of a bowl that had markings on it to tell
what time it was.
6. The First Spring Powered Clock
• The spring-powered clocks were
invented in 1500. At the time it was a
revelation because it was small and
portable. It was a large improvement,
but it still did not even have a minute
hand.
7. The Pendulum Clock
• A pendulum clock uses a swinging
pendulum to keep track of time. The
pendulum clock was developed in 1656.
This type of clock needs to be stationary in
order to work properly because motion
causes time inaccuracy.
8. Digital Clock
• The digital clock shows a numerical
representation of the current time. It was
developed in 1972 by a watch company
named Hamilton. There are two display
formats used for this kind of clock. 24 hour
notation which range from 0-23 and 12
hour notation, with the AM and PM
indicator.
9. Harmful Effects
• Some clocks are coated in radium, which
is a radioactive chemical. This material
can harm you if it comes into contact with
your body.
