Shape making chain.

[Philippe C.]

Some years ago I saw a demonstration on television on how the medieval
cathedral builders used a chain to draw circles and polygons.
But I cannot find anything on it.
I wouldn't know a better place than here to ask about it.

 

[Paul Herber]

Some years ago I saw a demonstration on television on how the medieval
cathedral builders used a chain to draw circles and polygons.
But I cannot find anything on it.
I wouldn't know a better place than here to ask about it.

From a time a bit before medieval but the principal is surely the
same.
http://www.megalithicsites.co.uk/math10.html

 

[Philippe C.]

Thank you very much. I knew this was the right forum. And I did not want to
join free masonry for this.
I'll read it on the train.
Maybe I'll make a street performance from it.