the WATER CLOCKthe WATER CLOCKKYOTO University of EducationKYOTO University of Education

Shigenobu KOBAYASHIShigenobu KOBAYASHI

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

This is

the WATER CLOCK model.

ContentsContents• 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.

Why was the WATER CLOCK produced?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.

The history aboutThe history about the WATER CLOCK in Japan. 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.

KyotoOhmi

AsukaOsaka

What is the WATER CLOCK(1)??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.) 1,2

4

3

5

The pictures of WATER CLOCK.The pictures of WATER CLOCK.

Station Ohmi Shrine

In OhmiIn Ohmi

Stick The 4 tanks made from stones is placed in the shape of stairs.

In AsukaIn AsukaWhole view

The ruins of Mizuoti

The water clock was here

Logs

(This is the marks of the pillar of the building)

• 　　　　　　　　　　　　　　　

Immediately after unearthing

Model

The water clock

What is the WATER CLOCK(2)??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

Why is it proportionally?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)

Relation between Relation between the WATER CLOCK and education.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)

Thank you