Folding of paper and like material

Claim 1

A SECTION OF PAPER SHEETS HAVING A FIRST FOLD LINE EXTENDING FROM THE RIGHT-HAND EDGE OF THE SECTION TO THE LEFTHAND EDGE OF SAID SECTION, A SECOND FOLD LINE INTERSECTING THE FIRST FOLD LINE AND SUBSTANTIALLY PERPENDICULAR THERETO, A FIRST SERIES OF SLITS EXTENDING ACROSS THE FIRST FOLD LINE FROM THE RIGHT HAND EDGE TO THE INTERSECTION OF THE FIRST AND SECOND FOLD LINES, SAID FIRST SERIES OF SLITS BEING ANGLED WITH RESPECT TO THE FIRST FOLD LINE SUCH THAT IF THE TWO END POINTS OF ANY SLIT WERE JOINED BY A STRAIGHT LINE, THAT PORTION OF SAID LINE BEGINNING AT SAID FIRST FOLD LINE AND EXTENDING UPWARDLY THEREFROM, WOUND FORM AN ACUTE ANGLE WITH THE FIRST FOLD LINE, AND A SECOND SERIES OF SLITS EXTENDING ACROSS THE FIRST FOLD LINE FROM THE LEFT-HAND EDGE TO THE INTERSECTION OF THE FIRST AND SECOND FOLD LINES, SAID SECOND SERIES OF SLITS BEING ANGLED WITH RESPECT TO THE FIRST FOLD LINE SUCH THAT IF THE TWO END POINTS OF ANY SLIT WERE JOINED BY A STRAIGHT LINE, THAT PORTION OF SAID LINE BEGINNING AT SAID FIRST FOLD LINE AND EXTENDING UPWARD THEREFROM, WOULD FORM AN OBTUSE ANGLE WITH THE FIRST FOLD LINE.