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.
An empty paste pot with a water well in the center makes an excellent inkwell and penholder. Fill the exterior well A with cement or plaster of paris, push the number of penholders to be held into the cement before it sets, moving them about occasionally to prevent the cement from sticking to them and to make the hole a little larger than the holder. The part B is for the ink. - Contributed by R. F. Pinkney, Lazar-eto del Mariel, Cuba.