Place the paper so that the long edges will be parallel with the front edge of the desk. Bisect the back edge of the paper; four inches from this point, directly towards the front edge, place a point; with this point as the center, construct a four-inch circle; draw a horizontal diameter of the circle; from the ends of this diameter construct a hexagon within the circle; connect all opposite points in hexagon.

The upper triangle will be side No. 1; upper right triangle, No. 2; lower right triangle, No. 3; and lower triangle No. 4.

With the upper right corner of upper triangle as a center, construct a circular margin on left side of triangle No. 1.

The base of the lower triangle shall be the upper side of a square; construct the square.

After transferring drawing to card-board, to a scale of one to two, cut out, preserving the circular margins on triangles Nos. 1, 2, and 3; crease, fold and glue.