13-knot rope
The medieval master-builders' 13-knot rope.
The 13-knot rope is used as a measuring and draughting tool.
The rope can be used to take, transfer and check measurements on the site.
The rope is used as a draughtsman's tool when laying out designs on the tracing floors.
The 13-knot rope is also a tool for demonstrating Pythagoras' theorem.
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