I have already explained the principle some years ago. In the meantime I have gained some knowledge about it, so that I can once again present a proposal for a construction method. This applies to both the drawing and a stakeout on site using simple surveying tools.
I present a prototype based on an axial dimension of one meter. This allows the Wunderkreis to be scaled to any desired scale.
We start with a basic framework with the definition of an axis, on which the input axis is to be placed here. That would be the line E-C. It runs centrally between the midpoints M3 and M4.
After defining the points A, E and B, the center point M3 can be defined by arcs. And from there, the other centers M2, M1 and M4 can be determined.
Note for experienced surveyors:
Right-angled (Cartesian) coordinates can be determined from the horizontal and vertical dimension chains. With appropriate measuring instruments, the most important main points can then also be polar staked out.
However, the radii themselves are best marked out with a line, wire or tape measure and marked with spray paint, sawdust or bark mulch.
It makes sense to mark out the upper semicircles (shown here in gray) around the center point M4. Then the four semicircles around the center point M3, as well as the left (5) and right (7) arc pieces (shown in green). The semicircles (drawn in gray) around the centers M1 and M2 form the final part.
Depending on the design of the boundary lines (according to the width) the Wunderkreis looks like. Shortly after entering the entrance below there is a branch. If one goes to the left, one walks first through the outer circuits. After passing through the inner double spiral, one gets back to the beginning.
We have a so-called walk-through or procession labyrinth before us. There is no strictly defined center.
The following drawing once again shows all the necessary construction elements and the corresponding lines for the walls and the path (in red, Ariadne’s thread).
Here is the drawing as a PDF file for printing, saving or viewing.