This section is from the book "Manual Of Cardboard Construction For Third And Fourth Grades", by Charles A. Kunou. Also available from Amazon: Manual of cardboard construction for third and fourth grades.
Draw a line 2" long and on it construct an equilateral triangle, apex down. On sides of triangle draw squares. Draw lines x, ½" from top side, find middle and draw points as in drawing. Add flap lines ¼" from outside of squares. Cut on full lines. Score and fold on dashed lines. Fold flaps outward and fasten with floss, as shown in sketch. Roll points over pencil outward as shown in sketch. Material: Tagboard.


 
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