the WATER CLOCK

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the WATER CLOCK

• KYOTO University of Education
• Shigenobu KOBAYASHI

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This is the WATER CLOCK

• It is the story 1400 years ago.
• This is
• the WATER CLOCK model.

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Contents

• 1.Why was the WATER CLOCK produced?
• 2.The history about the WATER CLOCK in Japan.
• 3.What is the WATER CLOCK(1)?
• 4.The pictures of the WATER CLOCK.
• 5.What is the WATER CLOCK(2)?
• 6.Why is it proportionally?
• 7.Relation between the WATER CLOCK and education.

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Why was the WATER CLOCK produced?

• A long time ago
• Ancient society progressed
• It is managed for
  24 hours
• Symbol of power to govern time
• Go to next
  page

DAY NIGHT LONG
SUNDIAL O.K. N.G. O.K.
SANDGLASS O.K. O.K. N.G.
WATER CLOCK O.K. O.K. O.K.
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The history about the WATER CLOCK in Japan.

• The water clock was in a capital.

Year Capital Water Clock
660 Asuka In Asuka
667 Ohmi In Ohmi
672 Nara The water clock has not been discovered.
794 Kyoto The water clock has not been discovered.
Kyoto
Ohmi
Osaka
Asuka
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What is the WATER CLOCK(1)??

• Parts
• 1.Water
• 2.Water tank
• 3.Siphon tube (This tube can carry water
  little by little. )
• 4.Doll
• 5.Stick(The doll has
• this stick with scale.)

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4
1,2
5
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The pictures of WATER CLOCK.
Ohmi Shrine
Station
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In Ohmi
Stick
The 4 tanks made from stones is placed in the
shape of stairs.
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In Asuka
Whole view
The ruins of Mizuoti
Logs
(This is the marks of the pillar of the building)
The water clock was here
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Immediately after unearthing

The water clock
Model
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What is the WATER CLOCK(2)??

• Usage
• 1.4 water tanks is full of water.
• 2.Water is carried to next water tank
• by Siphon tube.
• 3. An officer supplies water to the top tank.
• 4. Water goes into a last tank in proportion
  to time. ( Next page)
• 5.The stick which a doll has floats.
• 6. An officer tells time.
• 7. An officer sounds a bell
• 
  

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Why is it proportionally?

• Key Point is the Water level !!
• By placing some tanks, the water level of the
  3rd tank is kept constant.
• So, water moves in proportion to time
  by using siphon tube !!
• (We
  can see)
• Average rate of change about water level
  Time
• 
  Function
  (proportionality)

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Relation between the WATER CLOCK and education.

• Theme The WATER CLOCK inclosing subject
• History History of Kyoto
• Changes of a capital
• An old time system
• Science a Water level
• a Water pressure
• Mathematics Time
• Function
  (proportionality)

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• Thank you