Place paper so that the short edges will be parallel with the front of desk; bisect the back edge; two inches directly in front place a point which shall be the center of a one-inch horizontal line; draw the line. This line shall be the upper edge of an oblong one inch by twelve and one-fourth; draw the oblong; on the right and left sides of oblong, beginning at upper edge, set off a one-fourth inch space; below it twelve one inch spaces; join all opposite points.

Extend the upper and lower sides of fourth square three inches to the right and three inches to the left; connect the right and left ends of these lines; on these lines place points one inch and two inches from their right and left ends; connect opposite points, extending lines one inch above and one inch below; connect the upper and lower ends of these lines.

On the right and left sides of series of twelve squares, except the fourth square, construct one-fourth inch margins, cutting corners as in cube.

Transfer to a scale of one to two, cut, crease, fold and glue.