Bisect the back edge of paper.

Place a point on the left edge four inches from the back left corner. Place a point directly opposite on the right edge.

Place a point midway between points.

The point last placed shall be the middle point of a four inch horizontal line. Draw the line. From the right end of this line let fall an eight and one-fourth inch perpendicular. From the lower end of this line draw a horizontal line four inches to the left. Connect the left ends of horizontal lines.

In the right vertical beginning at the upper end set off a one-fourth inch space and below it four two-inch spaces. Place corresponding points on left vertical. The points on verticals one-fourth inch from the upper ends are points No. 1; those two inches below are No. 2; those two inches below No. 2 are o. 3, and so on down.

Join points No. 1, extending the line one-fourth inch to the right and left. Join points No. 2, extending the line two and one-fourth inches to the right and left. Draw a corresponding line through points No. 3, then connect points No. 4, extending the line one-fourth inch to the right and left.

Connect the right and left ends of the lines extending through points No. 2 and No. 3. On lines drawn through points 2 and 3

place points one-fourth inch from the right and left ends. Connect opposite points.

Construct similar margins on the right and left edges of the upper oblong, and the one above the lower oblong. Cut all corners of all margins as in the cube

Transfer on cardboard to the scale of three inches to two inches.

Crease, cut, fold, and glue, as in the cube.