抄録
Author already reported the field work results of waterwheel that has scooping plates and chains that was preserved in the Wu Institute of Wuxi in Jiangsu province of China. The waterwheel was called Longguo che (dragon waterwheel). By using the measurement values of the parts, the standard of the ruler was clarified. The author reported a field survey result of the length of the ruler about 4600 years before, called "Nippur cubit" which was named by the excavation place. Including these reports, the results that examined the concrete numerical value of the ruler in the East and West world based on literature and field survey is reported in this paper.
