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.
For back of safe Draw rectangle 4"x5½".
Draw oblique lines in top corners, ½" from angle as in drawing.
Locate holes in middle of top 1" apart and ½" from top line.
Cut out figure with scissors.
Punch holes and press in eyelets as in sketch.
For box of safe Draw rectangle l"x7".
Draw lines across ½" from each end.
Draw lines AB and CD, 2" from each end of rectangle and extending 2½" as in sketch, then connect B and D.
Divide into definite spaces to obtain proportions for bottom and flap of box, according to drawing.
Cut with scissors, score and fold figure.
Fasten box to back with floss, eyelets or fasteners. Material: Tagboard.





 
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