[Fig. 66]: Place the points A, B. Examine them to see that they are the same distance apart as in the original, and that they are level; place the point C exactly under A, and make A C equal in distance to A B; now place the point D opposite C and under B; try the distances between each point to see that they are the same; divide each side by a point half way, and then draw the lines.
[Fig. 67]: Repeat the last figure and add the lines A and B, taking great care that the points for them are correctly placed.
[Fig. 68]: Commence with the square as before; then join the half-way points.
[Fig. 69]: After the square is drawn, place the points A and B at the right height above the half-way points, and C, D at the proper distance from the corners, then draw the figure.
[Fig. 70]: The greatest care should be taken with the squares for this and the following figure, as the slightest error in them will destroy the symmetry of the drawing within; when the square is completed, join the opposite corners, and place on the crossed lines the points B, C, D, E; examine these to see that they are each at the same distance from the centre A, and that this distance is equal to the space from A to the sides of the square; when all are proved to be correct, complete the figure.
Fig. 66.
Fig. 67.
Fig. 68.