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.
When addressing rolled-up papers it is difficult to write on the curved surface. The papers also have a tendency
The Roll of Paper is Placed in the Curved Edge of a Book for Addressing
to roll away. By placing the roll in the hollow on the front edge of a large book, as shown in the sketch, it will be found easy to write on the wrapper. - Contributed by W. P. Shaw, Toronto, Canada.