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.
A sheet of corrugated paper is a handy thing to have on the writing desk, for the purpose of placing wet pens or brushes in its grooves. The paper absorbs the liquid, and the corrugations hold the pens or brushes in handy positions. A sheet of this paper is almost as useful a desk accessory as a blotter. - Contributed by James M. Kane, Doylestown, Pa.
Ill: The Depressions in the Paper Hold the Pens or Brushes and Also Absorb the Excess Fluid