Place the paper so that the long edges are parallel with the front of desk; bisect the back edge, and place a point four inches directly in front of it which shall be the center of a three inch horizontal line; draw the line; this line shall be the upper edge of an oblong three by five inches; draw the oblong.

On the right and left sides of oblong place points one-fourth inch from the upper edge; join opposite points.

Bisect the right and left sides of oblong; join these points with a ruler and place points one inch to the right and one inch to the left of oblong; with last points as centers describe two one and one-half inch circles and two two-inch circles.

Beginning at any point in the circumferences of inner circles divide them into one-fourth inch spaces; every other space in the circumference shall be the base of an isosceles triangle, whose apex touches the outer circle: draw the triangles.

Transfer to the scale of one to two. Cut, crease, fold and glue.

A cylinder of wood three inches in diameter and eight inches long should be provided for rolling and gluing the side of cylinder.