Knotted cord
A knotted cord was a primitive surveyor's tool for measuring distances. It is a length of cord with knots at regular intervals.
A knotted cord was a primitive surveyor's tool for measuring distances. It is a length of cord with knots at regular intervals.
A knotted cord was a primitive surveyor's tool for measuring distances. It is a length of cord with knots at regular intervals.
Source: Wikipedia "Knotted cord" · CC BY-SA 4.0
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