Ryoteisha

The ryoteizha (measuring wheel) is a surverying equipment which measures the distance between two points using a wheel mechanis, that indicates the distance traveled by multiplying the driving wheel perimeter by the number of wheel rotations. There were several surverying equipments during Tadataka Ino's time, but the ryoteisha was the most commonly used tool for measuring distances. Judging from the poor condition of the roads and the small size of the dricing wheel, it is doubtful that the measurements were accurate. It is thought that this tool was merely used with the aim to have the surveying conditions recognized those conserned.