the WATER CLOCK KYOTO University of Education Shigenobu

the WATER CLOCK KYOTO University of Education Shigenobu KOBAYASHI 1

This is the WATER CLOCK n It is the story 1400 years ago. This is the WATER CLOCK model. 2

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. 3

Why was the WATER CLOCK produced? A long time ago n Ancient society progressed 　　　　　 It is managed for 24 hours DAY n NIGHT LONG SUNDIAL O. K. N. G. O. K. SANDGLASS O. K. N. G. WATER CLOCK O. K. The symbol of power to govern time Go to next page 4

The history about the WATER CLOCK in Japan. n 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 Osaka Ohmi Asuka 5

What is the WATER CLOCK(1)? ? Siphon tube (This tube can carry water little by little. ) Doll Stick (The doll has this stick with scale. ) Water and Water tanks 6

The pictures of the WATER CLOCK. Station Ohmi Shrine 7

In Ohmi Stick The 4 tanks made from stones is placed in the shape of stairs. 8

In Asuka Whole view The ruins of Mizuoti Logs (This is the marks of the pillar of the building) The water clock was here 9

Immediately after unearthing n 　　　　　　　　 The water clock Model 10

What is the WATER CLOCK(2)? ? n 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 11

Why is it proportionally? n Key Point is the Water level !! By placing some tanks, the water level of the 3 rd 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) 12

Relation between the WATER CLOCK and 　　　　 education. n Theme : The WATER CLOCK : including subject History : History of Kyoto Changes of a capital An old time system Science : a Water level a Water pressure Mathematics : Time Function (proportionality) 13

Thank you 14