The Japanese Meizi Government employed a party of Dutch civil engineers. I. A. Lindo, one of them, made the levelling tour for the period during from 21st of July to 31st of November in 1872 from Horie to Tyôsi along the Tone River and the Edo River for the river improvement works. According to the results of this levelling Undo installed the Horie Bench-mark Stone of Y. P.(Yedogawa Peil) in the Seiryû Shrine in Horie in the end of 1872 for the river improvement works of the Tone and Edogawa River, which was the first bench-mark in the modem Japan. We describe the details of the levelling made by Lindo, based on the Lindo's Diary.
