This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
It would seem impossible to cut a hole in a piece of paper, 2 in. wide and 3 in. long, large enough to allow a person's body to pass through it, but if carefully cut as shown by the lines in the sketch, one will find with surprise that the paper can be extended so that the feat is easily accomplished. Make the cuts about 1/8in. apart and these will allow the paper to expand several times its size. - Contributed by H. Martine Warner, E. Orange, N. J.
Ill: The Slits Cut in the Paper Allow It to Expand Several Times the Size of the Original